Skip to content A B C D E F G H I J K L M N O P Q R S T U V W X Y Z pensiveness A thoughtful or reflective state, especially if sad or melancholic. Pensnett A suburban village in the Metropolitan Borough of Dudley, West Midlands, England (OS grid ref SO9189). Penson A surname. penstaff An upright plug for the drain of a mash tun. penstemon Any plant of the genus Penstemon, the beardtongues. penster A writer. penstick Synonym of penholder (“handle into which a nib etc. is fitted to form a pen”). penstock A sluice or pipe which allows the controlled flow of water from behind a dam, typically routing it to a turbine of a power plant. Penstone A hamlet in Colebrooke parish, Mid Devon district, Devon, England (OS grid ref SS7700). penstroke a stroke of a pen penstyldensovirus Any densovirus of the genus Penstyldensovirus pensum A task or imposition set as a school punishment. pensy pensive pent Confinement; concealment. Penta A surname. pentaacetate Any compound, but especially a derivative of a sugar, that has five acetate groups pentaacetylated Modified by the addition of five acetyl groups pentaacetylation Modification by the addition of five acetyl groups pentaacylated acylated in five positions pentaalanine Any oligopeptide consisting of five alanine residues pentaaluminium Five atoms of aluminium in a chemical compound. pentaaluminum pentaaluminium. pentaamine Any organic compound having five amino groups pentaantimonide Any antimonide containing five atoms of antimony per molecule, Sb₅. pentaarsenic Five arsenic atoms or ions in a compound (As₅). pentaazamacrocycle Any macrocycle that has five nitrogen atoms in the ring pentabamate A carbamate tranquilizer. pentaband Supporting five frequency bands. pentabasic Containing five replaceable hydrogen atoms. pentabiotic A veterinary antibiotic related to penicillin pentabismuth Five bismuth atoms or ions in a compound (Bi₅). pentablock Describing a block copolymer composed of five different monomers pentabody A pentavalent ligand that attaches to transmembrane proteins pentaborane Either of two boranes containing five boron atoms, but especially the stable compound B₅H₉ once proposed as a rocket fuel pentaborate The oxyanion of boron B₅O₈⁻; any salt containing this anion pentabothropic Relating to, or active against five species of Bothrops vipers pentabrach A variant of amphibrach that has five short syllables pentabromide any bromide containing five bromine atoms in each molecule pentacalcium Five atoms of calcium in a compound. pentacameral Having five chambers; comprising five separate parts. pentacapsular Having five capsules. pentacarbide Any carbide containing five carbon atoms per molecule pentacarbonate Any compound containing five carbonate groups in each molecule or unit cell pentacarbonyl Any metal carbonyl containing five carbonyl groups pentacarboxylate Any compound containing five carboxylate groups or anions pentacarpellary Having five carpels. pentacarpellate Having five carpels pentacation A cation that has five positive charges pentacationic Relating to a pentacation pentacellular Having five cells. pentacene A polycyclic aromatic hydrocarbon; the acene containing five fused rings. pentacephalous Having five heads. pentacerotid Any fish in the family Pentacerotidae. pentachloride any chloride containing five chlorine atoms in each molecule pentachloro Five chlorine atoms in a compound pentachloroanisole A pentachloro derivative of anisole (in which the five hydrogens of the benzene ring are replaced by chlorine) pentachlorobenzene A chlorinated derivative of benzene C₆HCl₅ pentachlorobiphenyl Either of forty-six isomers of the polychlorinated biphenyl containing five chlorine atoms pentachlorocyclohexane Any pentachloro derivative of cyclohexane, but especially 1,1,2,2,3-pentachlorocyclohexane pentachlorocyclohexanol Any pentachloro derivative of cyclohexanol, but especially 2,3,4,5,6-pentachlorocyclohexanol pentachloronitrobenzene A fungicide formally derived from nitrobenzene; it is an off-white or yellow solid with a musty odour. pentachlorophenol A fully chlorinated derivative of phenol that is used as a fungicide and wood preservative. pentachord Five notes (pitch classes) in a scale. pentachoron A four-dimensional object analogous to a tetrahedron, constructed out of five tetrahedra. pentachotomy The division of one into five separate but related parts. pentachromacy The quality of having five independent channels for conveying color information in the eye. pentachromat One whose vision exhibits pentachromacy; one who can distinguish five primary colors. pentachromatic Relative to pentachromacy pentachrome A complex staining procedure that stains various parts of cells different colours. pentachromic Containing five colours. pentacid Capable of neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; said of certain complex bases. pentacle A flat talisman, almost always star-shaped, made of parchment, sheet metal, or other substance, marked with a magic symbol or symbols, used in magical evocation. pentacles A suit of the minor arcana in tarot, bearing the symbol of disks marked with pentagrams; also called disks or coins. pentacoccous Composed of five united carpels with one seed in each. pentacolor Having five colors. pentacolored Having five colors. pentacontagon A fifty-sided polygon. pentacontahedron A polyhedron with fifty faces. pentacontaheptachoron A four-dimensional polytope that has 57 cells pentacontane Any of very many isomers of the aliphatic hydrocarbon having fifty carbon atoms, but especially n-pentacontane CH₃(CH₂)₄₈CH₃ pentacoordinate Having a coordination number of five pentacoordinated coordinated with five (the same or different) ligands pentacoordinating Having five coordinate bonds to a metal ion pentacoordination The condition of being pentacoordinate pentacopper Five atoms of copper in a chemical compound. pentacosadiene Any of very many isomeric forms of an unsaturated aliphatic hydrocarbon having 25 carbon atoms and two double bonds pentacosane Any of very many isomeric forms of a saturated aliphatic hydrocarbon having 25 carbon atoms, but especially n-pentacosane CH₃(CH₂)₂₃CH₃ that is found in beeswax pentacosanoic Of or pertaining to pentacosanoic acid or its derivatives. pentacosanoyl The univalent radical derived from pentacosanoic acid by loss of the hydroxy group pentacosene Any of very many isomeric forms of an unsaturated aliphatic hydrocarbon having 25 carbon atoms and one double bond pentacosiomedimni The highest class of citizens in Ancient Greece pentacovalent Having five covalent bonds pentacrinin Any of various red or purple pigments found in certain crinoids of the former genus Pentacrinus, for example one sea lily now named Neocrinus naresianus. pentacrinite Any crinoid of the genus Pentacrinites. pentacrinoid A larva in a certain stage in the cycle of a comatula, and similar species, when it is still attached by a stem. pentacron A solid with five summits (vertices), such as a square pyramid pentacrostic A set of verses arranged so that the name of the subject occurs five times, the whole set of verses being divided into five different parts from top to bottom. pentact A pentactinal structure, one with five rays. pentactinal Having five rays pentactine A pentactinal spicule of a sponge pentacube A polycube composed of five cubes pentacular Of or relating to a pentacle. pentaculum pentacle pentacuspid Having five cusps. pentacuspidate Having five cusps pentacycle A five-wheeled pedal cycle. pentacyclic Having five rings, especially five fused rings as in many triterpenoids. pentacyclization Formation of a pentacyclic compound. pentacyclosqualene A pentacyclic triterpene hydrocarbon (hydropicene) formed from squalene pentacylindrical Composed of five cylinders pentad Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades. pentadactyl Having five digits on a limb. pentadactylic pentadactylous pentadactylism pentadactyly pentadactyloid Having the form of, or a structure modified from, a pentadactyl limb; having an underlying structure that is a limb with five digits (although these may be fused or only exist in vestigial form). pentadactylous pentadactyl pentadactyly The condition of having five digits (fingers or toes) on a limb pentadal Of or related to a 5-year period. pentadecacopper Fifteen atoms of copper in a compound. pentadecagon A polygon with fifteen sides. pentadecagonal Having the form of a pentadecagon pentadecahedral In the form of a pentadecahedron. pentadecahedron A polyhedron with fifteen faces. pentadecahydrate A hydrate containing fifteen molecules of water per molecule or unit cell. pentadecamer An oligomer having fifteen subunits. pentadecameric Of or pertaining to a pentadecamer pentadecanal The aliphatic aldehyde that has 15 carbon atoms pentadecane Any of very many isomeric saturated aliphatic hydrocarbons having fifteen carbon atoms; but especially n-pentadecane, CH₃(CH₂)₁₃CH₃ pentadecanoate Any salt or ester of pentadecanoic acid. pentadecanoic Of or pertaining to pentadecanoic acid or its derivatives. pentadecanoin Any glyceride of pentadecanoic acid pentadecanol A saturated aliphatic alcohol that has fifteen carbon atoms, but especially 1-pentadecanol pentadecanone Any of several isomeric aliphatic ketones having fifteen carbon atoms pentadecanoyl The univalent radical derived from pentadecanoic acid by loss of the hydroxy group pentadecaoxide Any oxide containing fifteen atoms of oxygen per molecule, O₁₅. pentadecapeptide An oligopeptide composed on fifteen amino acid residues pentadecasyllabic Synonym of quindecasyllabic. pentadecathlon A sporting event consisting of fifteen different sports or contests. pentadecene Any alkene that has fifteen carbon atoms and one double bond, but especially 1-pentadecene or cis 7-pentadecene pentadecenoate Any salt or ester of pentadecenoic acid pentadecenoic Relating to pentadecenoic acid or its derivatives pentadecenoyl The univalent radical derived from pentadecenoic acid by loss of the hydroxy group pentadecimal Based on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E. pentadecyl Any of very many isomeric univalent hydrocarbon radicals, C₁₅H₃₁, formally derived from pentadecane by the loss of a hydrogen atom pentadecylic Relating to the pentadecyl radical pentadecyne Any alkyne that has fifteen carbon atoms pentadelphous Of a flower or plant: having its stamens fused together at least partly by the filaments so that they form five separate groups, some of which may contain a single stamen. pentadelphy Presence of pentadelphous stamen. pentadentate Forming five separate chemical bonds to a coordinating metal ion. pentadeuterated deuterated in five positions, or with five atoms of deuterium