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 tetraphenylethylene An organic compound, 1,2,2-triphenylvinylbenzene. tetraphenylmethane An organic compound consisting of a methane core with four phenyl substituents. tetraphenylphosphonium The univalent cation formally derived from phosphonium by replacing each hydrogen atom with a phenyl group. tetraphenylporphyrin A synthetic heterocyclic compound that resembles naturally occurring porphyrins. tetraphenylsilane The organosilicon compound (C₆H₅)₄Si tetraphid Any moss in the family Tetraphidaceae. tetraphobia Custom of avoiding the number four (4) commonly seen in those East Asian countries in whose local languages the words for "4" and "death" are paronymous or homophonous. tetraphocomelia phocomelia of all four limbs tetraphonic In four channels. tetraphosphate Any compound containing four phosphate groups or ions tetraphosphide Any phosphide having four phosphorus atoms tetraphosphonate A chemical compound with molecules with four phosphonate groups. tetraphosphorus four atoms of phosphorus in a compound tetraphosphorylated phosphorylated with four units of phosphoric acid tetraphthalate Any compound that contains four phthalate groups tetraphthong A monosyllabic vowel combination consisting of two diphthongs, or a semivowel followed by a triphthong. tetraphyletic Of or relating to four phylums. tetraphyllidean Any tapeworm of the order Tetraphyllidea tetraphyllous Having four leaves. tetrapla A text presented in four parallel versions, especially (historical) the version of the Bible presented in such a fashion by Origen. tetraplatinum Four atoms of platinum in a chemical compound. tetraplegia Paralysis of all four limbs. tetraplegic A quadriplegic. tetraples Synonym of tetrapla. tetraplet Synonym of quartet: A group of four things. tetraplex A complex formed from four of the same moieties tetraplicate In or of four identical experiments. tetraploid Having four sets of chromosomes. tetraploidic tetraploid tetraploidization The doubling of chromosomes to produce tetraploidy tetraploidize To modify by tetraploidization tetraploidized Converted to tetraploidy by tetraploidization tetraploidy The state of being tetraploid, having four sets of chromosomes. tetrapod Any item with four arms or four feet, such as a light stand, a gun mount, etc. tetrapodal Having four feet. tetrapodean Of, pertaining to, or characteristic of the tetrapods (Tetrapoda). tetrapodic tetrapod tetrapodomorph Any vertebrate tetrapod of the clade Tetrapodomorpha. tetrapodous tetrapod; four-limbed tetrapody A set of four metrical feet. tetrapolar Having or relating to four poles. tetrapolarity The condition of being tetrapolar tetrapolis A group of four cities. tetrapolitan Relating to a tetrapolis, or group of four towns; applied to the Tetrapolitan Confession. tetraporate Having four pores. tetraporphyrin The porphyrin that is composed of four pyrrole units tetrapotassium Four potassium ions in a compound tetrapous Having four feet; four-footed tetrapropylammonium The quaternary ammonium cation (CH₃CH₂CH₂)₄N⁺ tetrapterous Having four wings or wing-like elements. tetraptote A noun that has four cases. tetraptych a polyptych having four sections tetrapylon A Roman-style cubic structure with a gate on each of its four sides. tetrapyramidal Composed of four pyramids tetrapyrenous Having four stones or seeds in the fruit. tetrapyrrole any of several natural pigments having a structure of four pyrrole rings connected by a one-carbon unit tetrapyrrolic Of, pertaining to, or being a tetrapyrrole. tetraqua Four water molecules in a chemical compound. tetraquark A hypothetical meson composed of four valence quarks. tetraquetrous Having four sharp angles. tetraradial radiating outward in four directions tetraradiate Having four rays tetraradical A free radical having a four unpaired electrons tetrarch A governor or ruler of a quarter of a country, especially of a fourth part of a province in or client state of Ancient Rome. tetrarchate A tetrarchy. tetrarchic Of or related to a tetrarchy, particularly (historical) the era of Diocletian and his three coemperors in Late Antiquity. tetrarchical Of or pertaining to a tetrarch or tetrarchy. tetrarchy A government where power is shared by four people, especially (historical) the Herodian tetrarchy established in Judea after the death of Herod and the Tetrarchy of Diocletian which ruled the Roman Empire in the years 293-313. tetraribonucleotide Any oligoribonucleotide containing four ribonucleotide units tetrarogid Any fish in the family Tetrarogidae. tetrarooseveltite A tetragonal-dipyramidal mineral containing arsenic, bismuth, and oxygen. tetrarsenide Any arsenide containing four atoms of arsenic per molecule tetrasaccharide Any oligosaccharide having four sugar residues tetraschistic Characterized by division into four parts. tetraselenide Any selenide containing four atoms of selenium per molecule tetrasemic Equivalent to four short syllables, consisting of four moras as a dactyl, anapest, or spondee. tetrasepalous Having four sepals. tetrasexagesimal The Base64 text encoding scheme. tetrasialic Having four sialic groups tetrasialotransferrin A transferrin with four sialic acid residues attached. tetrasialylated Modified by the addition of four sialic acid residues tetrasilabenzene A heteroaromatic compound in which four carbon atoms of a benzene ring have been replaced by silicon atoms. tetrasilicate Any compound containing four silicate anions. tetrasilicide Any silicide having four silicon atoms tetrasilicon Four silicon atoms in a molecule (Si₄) tetrasiloxane Any siloxane having four -Si-O- groups tetrasilver Four silver atoms in a compound. tetraskelion A figure consisting of four limbs, radiating from the center; especially a fylfot or swastika. tetrasodium Four sodium atoms or ions in a compound tetrasome A complex of four homologous chromosomes formed during meiosis tetrasomic Having four copies of a particular chromosome tetrasomy The condition of being tetrasomic tetraspace Four-dimensional space. tetraspan Any of a family of membrane glycoproteins whose multimolecular complexes have four transmembrane domains tetraspanin A tetraspan. tetraspastic Relating to spastic tetraplegia tetraspasticity The condition of being tetraspastic tetraspermous Having four seeds. tetraspherical Relating to or composed of four spheres. tetraspirane Any compound having five rings linked spirocyclically via four carbon atoms tetrasporaceous Of or relating to the Tetrasporaceae. tetrasporal Synonym of tetrasporous. tetrasporangiate Having four sporangia tetrasporangium A sporangium that produces tetraspores tetraspore Any of the four asexual spores produced by a sporangium. tetrasporic Relating to tetraspores. tetrasporophyte A sporophyte, in red algae, that produce tetraspores (actually meiospores) tetrasporophytic Relating to tetrasporophytes tetrasporous Relating to tetraspores. tetrasquillid Any mantis shrimp in the family Tetrasquillidae. tetrastarch A hydroxyethyl starch with four hydroxyethyl groups out of each 11 hydroxyls. tetrastatin A C-terminal domain of a collagen that inhibits melanoma growth tetrasterigmate Having four sterigmata. tetrasternum The second sclerite of a segmented sternal complex. tetrastich A four-line stanza. tetrastichal In the form of a tetrastich. tetrastichic In the form of a tetrastich. tetrastichous Arranged in four vertical rows. tetrastoon A four-sided colonnade, typically enclosing a courtyard tetrastrand A macromolecular structure composed of four strands (nucleotide chains). tetrastrontium Four atoms of strontium in a chemical compound. tetrastyle A building (especially a portico) that has four columns tetrastylic Having four columns, like a tetrastyle. tetrastylon A kind of cavaedium supported by columns placed at the four angles of the impluvium. tetrasubstituted substituted with four substituents tetrasubstitution Any substitution reaction in which four groups are substituted. tetrasulfated Modified by the addition of four sulfate groups tetrasulfide Any sulfide having four sulfur atoms tetrasulfonate Any compound containing four sulfonate groups or ions tetrasulfonated Modified by the addition of four sulfonate groups tetrasulfur The allotrope of sulfur, S₄ having four atoms in a ring tetrasyllabic Having four syllables. tetrasyllable A word comprising four syllables. tetrataenite The tetragonal crystalline form of taenite tetrate To perform tetration. tetratelluride Any telluride containing four atoms of tellurium per molecule tetratennesside A tennesside containing four atoms of tennessine tetraterpene Any terpene formed from eight isoprene units, and having forty carbon atoms; they include the carotene plant pigments. tetraterpenic Related to or derived from a tetraterpene tetraterpenoid a terpenoid having a C₄₀ skeleton tetratetracontane Any of very many isomers of the aliphatic hydrocarbon having forty-four carbon atoms, but especially n-tetratetracontane CH₃(CH₂)₄₂CH₃ tetrathecal Having four thecae. tetratheism A belief in four gods. tetratheist A believer in, or advocate of, tetratheism. tetrathiafulvalene An organosulfur compound related to the hydrocarbon fulvalene by replacement of four CH (carbon-hydrogen) groups with sulfur atoms. tetrathianaphthacene A chemical compound, C₁₈H₈S₄. tetrathienoacene Any derivative of an acene that has four thieno groups tetrathiolate Any compound containing four thiolate groups tetrathiomolybdate The thiometallate anion MoS₄; any salt containing this anion tetrathionate The oxyanion S₄O₆²⁻ derived from tetrathionic acid; any salt containing this ion.