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 pentadiagonal In which the only nonzero entries are on the main diagonal, and the first two diagonals above and below it pentadic of, or relating to a pentad pentadicity The property of being pentadic. pentadiene Either of two isomeric dienes derived from pentane pentadienoate Any salt or ester of pentadienoic acid. pentadienoic Of or pertaining to pentadienoic acid or its derivatives pentadienone Any aliphatic ketone that has five carbon atoms and two double bonds pentadienyl Any univalent radical or ion derived from a pentadiene pentadin A sweet-tasting protein found in the climbing shrub Pentadiplandra brazzeana. pentadodecahedron a regular dodecahedron having twelve pentagonal faces pentadrachm An ancient Cyrenaic coin that was worth five drachmas. pentaene Any compound having five carbon-carbon double bonds pentaenoic Relating to any pentaenoic acid or its derivatives pentaerythritol The polyhydric alcohol 2,2-bis(hydroxymethyl)1,3-propanediol C(CH₂OH)₄ pentaerythrityl The tetravalent radical derived from pentaerythritol pentaethylacetophenone A chemical compound, C₁₈H₁₃O. pentaethylenehexamine The polyethylene amine H₂N-CH₂CH₂-NH-CH₂CH₂-NH-CH₂CH₂-NH-CH₂CH₂-NH-CH₂CH₂-NH₂. pentafid Divided or split into five parts. pentaflake A fractal formed by arranging clusters of pentagons around a central pentagon pentafluoride Any fluoride containing five fluorine atoms in each molecule. pentafluoro Five fluorine atoms in a molecule pentafluorobenzoic Used to name the pentafluoro derivatives of benzoic acid pentafluorobenzoyl The 2,3,4,5,6-pentafluoro derivative of the benzoyl radical pentafluorobenzyl A form of the benzyl radical in which each of the hydrogen atoms of the benzene ring has been replaced by fluorine pentafluoroethane A refrigerant and fire suppression agent with the chemical formula CF₃CHF₂. pentafluoroethyl Any pentafluoro derivative of an ethyl group pentafluorophenol A derivative of phenol in which the five hydrogen atoms have been replaced by those of fluorine ( C₆F₅OH ) pentafluorophenyl A phenyl group in which the five hydrogen atoms have been replaced by those of fluorine ( C₆F₅- ) pentafluoropyridine The fully fluorinated derivative of pyridine; it is used in the synthesis of various heterocyclic compounds. pentafluorostyrene A derivative of styrene in which each hydrogen of the benzene ring has been replaced by fluorine; it is used to make specialized polymers. pentafluorosulfanyl Any pentafluoro derivative of a sulfanyl radical pentaformylgitoxin gitoformate pentafunctional That has five functions pentafunctionalised Having five functional groups pentafurcation A division into five branches. pentafuside A synthetic polypeptide intended as a treatment of HIV infection pentagalacturonate A salt or ester of pentagalacturonic acid. pentagalacturonic Relating to pentagalacturonic acid and its derivatives pentagalloyl Five galloyl groups in a compound pentagalloylglucose The ester of glucose with five molecules of gallic acid pentagamist Someone who has five spouses at the same time. pentagamy The state of having five spouses simultaneously. pentagastrin A synthetic polypeptide that has effects like gastrin when given parenterally. pentagenarian A person between 50 and 59 years old. pentagestrone A steroidal progestin of the 17α-hydroxyprogesterone group that was never marketed. pentaglot In five languages. pentaglucoside A glucoside containing five glucose units pentaglutamate Any compound (typically an ester) that has five glutamate groups pentaglycine An oligopeptide (or section of a protein) consisting of five glycine amino acids pentaglycosylceramide A glycosylceramide in which the sugar is a pentasaccharide pentagon A polygon with five sides and five angles. pentagonal Of, relating to, or shaped like a pentagon. pentagonally In the form of a pentagon; with five angles. Pentagonese The jargon used by the United States Department of Defense. pentagonism In leftist political thought, a stage beyond imperialism embodied by the United States. pentagonist Related to pentagonism. pentagonite A silicate of calcium and vanadium found in basalts and tuffs pentagonohedron Any polyhedron that has pentagonal faces. pentagonoid Approximately pentagonal pentagram The shape of a five-pointed star constructed of five intersecting lines meeting at the vertices, such that a central pentagon and five surrounding isosceles triangles are formed; often with magical connotations; a 5/2 (or 5/3) star polygon. pentagrammatic Pentagrammic. pentagrammic Being or pertaining to a pentagram. pentagraph A device used in surveying composed of four flat, straight brass rules, two of which are long and are connected by a double pivot at the end to create a V shape, and two of which are short and joined by a double pivot to create another V shape pointed away from the first, with the other ends of the short rules connected at the halfway mark of the long rules, so that the entire figure creates a parallelogram. pentagrid A tiling of the hyperbolic plane with regular pentagons pentaguanine Five consecutive guanine residues in a protein or peptide pentagynous Having five styles or pistils. pentahalide Any halide containing five halogen atoms pentahedral relating to a pentahedron pentahedrally In pentahedral form. pentahedron A polyhedron with five faces. pentahelicene The helicene having five benzene rings fused into a flat spiral pentahex A polyhex composed of five hexagons pentahistidine Five consecutive histidine amino-acids in a peptide or protein; the equivalent repeats in a nucleic acid or gene pentahydrate A hydrate whose solid contains five molecules of water of crystallization per molecule, or per unit cell. pentahydrated Combined with five molecules of water pentahydric Having five hydroxy groups. pentahydride Any hydride containing five atoms of hydrogen per molecule pentahydrite An evaporite, consisting of magnesium sulphate pentahydrate, with the chemical formula MgSO₄·5H₂O. pentahydroborite A basic calcium borate found in skarn minerals pentahydrocalcite A pentahydrated form of calcite pentahydroxide Any hydroxide having five hydroxyl groups. pentahydroxy Five hydroxy groups in a molecule. pentahydroxyflavone Any flavone with five hydroxyl groups. pentail A species of treeshrew (Ptilocercus lowii) of Borneo, with a very long, quill-shaped tail, which is scaly at the base and plumose at the tip. pentaiodide Any iodide having five iodine atoms pentairon Five iron atoms or ions in a compound (Fe₅). pentakaidecahedral In the form of a pentakaidecahedron. pentakaidecahedron Synonym of pentadecahedron. pentaketide Any polyketide composed of five ketide monomers pentakis Having five identical units pentakisphosphate A compound having five simple phosphate groups pental sodium thiopental, a common anesthetic pentalamellar Having five layers pentalamide An antifungal drug. pentalaminar Having five layers pentalateral A decagon whose opposite sides are parallel. pentalayer Having five layers pentalead Five atoms of lead in a chemical compound. pentalemma An argument analogous to a dilemma, but involving five alternatives. pentalene The antiaromatic bicyclic hydrocarbon consisting of two fused cyclopentadiene rings pentalenene A triquinane sesquiterpene related to pentalenic acid pentalenolactone A sesquiterpene lactone, isolated from some Streptomyces species, that shows antibiotic activity pentalingual Written in or otherwise expressed through five languages. pentallelic Composed of five alleles pentalobate Having five lobes. pentalobe A tamperproof screw whose drive has five rounded edges. pentalobed Having five lobes pentalobular Having five lobules. pentalogue A series of five statements. pentalogy A set of five works of art that are connected, and that can be seen either as a single work or as five individual works. pentalongin A pyranonaphthoquinone antibiotic isolated from the East African medicinal plant Pentas longiflora pentaloop A loop of five nucleotides in a nucleic acid pentalophodont Having five ridges pentalophodonty The condition of being pentalophodont pentalpha A pentagram. pentaluminium pentaaluminium. pentaluminum pentaaluminium. pentalysine An oligopeptide composed of five lysine amino acids pentamagnesium Five magnesium atoms in a molecule. pentamanganese Five atoms of manganese in a chemical compound. pentamannose A pentasaccharide composed of five mannose units pentamannosyl Five mannosyl groups in a compound pentamer An oligomer having five subunits. pentameral fivefold (of a symmetry group) pentamerally In a pentameral manner. pentamercury Five mercury atoms or ions in a compound (Hg₅). pentameric Of or pertaining to a pentamer pentamerid Any brachiopod of the genus Pentamerus. pentameride Any extinct brachiopod of the order †Pentamerida pentamerism five-part radial symmetry pentamerization The formation of a pentamer. pentamerize To polymerize to form a pentamer pentamerized Converted into a pentamer pentameroid Any brachiopod of the family Pentamerida, known only as fossils pentamerous In five parts; made up of five parts. pentamerously In a pentamerous manner. pentamery the condition of being pentameric pentameter A line in a poem having five metrical feet. pentamethyl five methyl groups in a molecule pentamethylbenzene An aromatic hydrocarbon, C₆H(CH₃)₅, obtained by methylation of xylene. pentamethylcyclopentadiene The derivative of cyclopentadiene 1,2,3,4,5-pentamethylcyclopentadiene that is used in organic synthesis pentamethylcyclopentadienyl The cation derived from pentamethylcyclopentadiene pentamethylcyclopentasiloxane A cyclic organosilicon compound consisting of a five-membered ring of alternating silicon and oxygen atoms, with five methyl groups attached to the silicon atoms. It is primarily used as a precursor in the production of specialized silicones and polymers. pentamethylene Five methylene groups in a molecule pentamethylenediamine Cadaverine. pentamethylenetetrazol Pentylenetetrazol. pentametric Relating to or exhibiting pentameter. pentametrically In pentameter. pentametrist One who writes in pentameter. pentamidine A synthetic antibiotic drug used chiefly in the form of its salt C₂₃H₃₆N₄O₁₀S₂ especially to treat protozoal infections (such as leishmaniasis) and to prevent pneumocystis pneumonia.