Word origins

• suedaAn area with a dense covering of plants of the genus Suaeda, family Amaranthaceae; such plants collectively; seepweed.
• syconAny sponge of the genus Sycon.
• syconoidA member of the genus Sycon of sponges.
• syllidAny polychaete worm of the family Syllidae.
• symphlebianAny arctiine moth of the genus Symphlebia.
• synapheaThe metrical continuity between one colon and another.
• synapsidPertaining to the class Synapsida of animals which have an opening low in the skull roof behind each eye, leaving a bony arch beneath each.
• syrphidOf or pertaining to flies of the family Syrphidae.
• syrphusA fly of the genus Syrphus or the family Syrphidae.
• tageteSynonym of tagetes (“individual plant of the genus Tagetes”).
• tanacetinThe bitter principle of common tansy (Tanacetum vulgare).
• taraxacinA bitter glycoside, extracted from dandelion, once used as a diuretic.
• tardigradeSluggish; moving slowly.
• tarennaAny flowering plant of the genus Tarenna.
• taterilGerbil of the genus Taterillus.
• tchagraAny of the birds in the genus Tchagra, found in the dry forests and savannahs of the Afrotropics.
• tecominA glucoside and pigment found in the heartwood of Tecoma stans (formerly Bignonia tecoma).
• temnospondylAny of many extinct primitive amphibians (labyrinthodonts) of the order Temnospondyli, from the Carboniferous, Permian and Triassic periods.
• tenebrionidAny member of family Tenebrionidae of darkling beetles.
• Tengmalm's owlA species of owl, Aegolius funereus.
• tephritidA member of the Tephritidae, a family of fruit flies.
• terebratulaAny member of the genus Terebratula of brachiopods.
• terebratulidA brachiopod of the order Terebratulida, having a short pedicle and a calcareous loop supporting the tentacles.
• terminalianAny large tree and flowering plant of the genus Terminalia.
• thalassiophyteany plant belonging to one of the obsolete taxonomic groups known as Thalassiophyta, which were believed to comprise various parts of the marine algae or seaweeds, depending on the classification system.
• thapsaneAny of a family of sesquiterpenes that are found in Mediterranean plants.
• theiformSimilar to tea.
• thelephoraceousBelonging to the Thelephoraceae.
• thelypodyAny of the cruciferous flowering plants in the genus Thelypodium.
• thescelosaurAny dinosaur of the subfamily Thescelosaurinae.
• tiglinAn organic compound found in the seeds of Croton tiglium.
• titanoboaAny large, extinct snake in the genus †Titanoboa.
• titanosuchianAny dinocephalian of the family Titanosuchidae.
• toadhead agamaAny lizard of the genus Phrynocephalus.
• tolypeAny of the genus Tolype of moths of the Americas.
• Tonkin pit viperOvophis tonkinensis, a species of common pit viper found in Southeast Asia.
• toonaA plant of the genus Toona; red cedar.
• toothed whaleAny of the parvorder Odontoceti of cetaceans that have teeth instead of baleen, including sperm whales, beaked whales, dolphins, and others.
• tortricidAny moth of the family Tortricidae, also known as leafroller moths.
• tortricineAny moth of the subfamily Tortricinae
• tortrixA tortrix moth, any member of the family Tortricidae
• totarolAn aromatic sterol present in the heartwood of Podocarpus totara
• toxicarolAn organic compound isolated from Tephrosia toxicaria.
• trachymedusaAny cnidarian of the order Trachymedusae
• trapezitineAny skipper butterfly of the subfamily Trapezitinae.
• tribulosisA form of photodermatitis in sheep, caused by eating the plant Tribulus terrestris.
• trichostrongyleAny nematode of the genus Trichostrongylus.
• trichostrongyloidAny nematode of the superfamily Trichostrongyloidea
• triodiaAny grass of the genus Triodia native to Australia.
• triticinA carbohydrate isomeric with dextrin.
• tritoniaAny of the genus Tritonia of flowering plants in the iris family.
• trochilidineOf, or pertaining to hummingbirds.
• trocholitidAny nautiloid cephalopod in the family Trocholitidae.
• trogonidAny bird in the family Trogonidae, the trogons.
• trogonophidAny lizard in the family Trogonophidae.
• trombiculiasistrombiculosis
• trombiculidAny of the family Trombiculidae of mites.
• trombidiasisInfestation with mites or chiggers of the genus Trombicula.
• trombidiidAny member of the Trombidiidae.
• troodontidAny member of the family †Troodontidae of small, bird-like theropod dinosaurs with large brains, large eyes, and a retractable claw on the second toe of each hind foot, similar to a farmer's sickle, used for slashing at prey.
• turban shellA marine gastropod of the family Turbinidae, or the shell thereof.
• turbellarianAny flatworm of the class Turbellaria.
• turtleheadA white turtlehead, an American perennial herb (Chelone glabra) with white flowers.
• tylophorineThe plant alkaloid (13aS)-2,3,6,7-tetramethoxy-9,11,12,13,13a,14-hexahydrophenanthro[9,10-f]indolizine that has antiangiogenic and antitumor properties
• typhasterolA particular brassinosteroid
• tyrannoraptoranAny dinosaur of the clade Tyrannoraptora.
• tyrant flycatcherAny of a group of passerine birds, of family Tyrannidae, that inhabit the Americas.
• udoteaceanAny member of the algal family Udoteaceae.
• ulmosideAn aucubigenin diglycoside found in the bark of Ulmus wallichiana.
• umbrineAny of several food fishes of the genus Umbrina of drums.
• uncinariasisInfection by hookworms of the genus Uncinaria.
• uredinologyThe mycological study of rust fungi.
• usdagalunAn isopod of the species Lirceus usdagalun (Lee County cave isopod).
• ushikuvirusA virus of the taxon Ushikuvirus, a large DNA virus that infects vermamoeba (amoeba of the genus Vermamoeba)
• uwuInnocently, often cloyingly cute.
• vangaAny of several passerine birds, of the family Vangidae, from Madagascar.
• vargulinThe luciferin found in the ostracod Cypridina hilgendorfii (also named Vargula hilgendorfii).
• vaticanolAny of a class of resveratrol oligomers found in Vatica.
• vegaviidAny species of the extinct family Vegaviidae of goose-like birds.
• veneridA short-necked clam of the family Veneridae.
• ventilaginA resinous colouring matter obtained from the plant Ventilago madraspatana.
• vermetusAny of the many species of marine gastropods belonging to Vermetus and allied genera, of the family Vermetidae.
• verticordiaA plant belonging to the genus Verticordia.
• vespidCharacteristic of the wasp family Vespidae.
• vibriolysinA thermostable form of thermolysin present in bacteria of the genus Vibrio.
• viburninA substance derived from the black haw viburnum (Viburnum prunifolium), used to treat uterine disease.
• vigninA globulin found in the cowpea, resembling legumin.
• violaninA pigment found in the wild pansy (Viola tricolor).
• viridGreen, verdant.
• vorticellaAny protozoan of the genus Vorticella.
• waldheimiaAny of the extinct brachiopod genus †Waldheimia, now a subgenus of Terebratus.
• weisiensinAny of a class of ent-kaurane diterpenoids isolated from the herb Rabdosia weisiensis.
• white-bellied ratAny rat species of the murid genus Niviventer of Southeast Asia.
• white poplarany tree of species Populus alba, a poplar found in Central Europe, Morocco and central Asia.
• witchweedAny of several flowering plants of the genus Striga, from Africa and Asia, some of which are parasitic to crops.
• woodwardiaAny of the genus Woodwardia of chain ferns.
• xanthorrhoeaAny of the genus Xanthorrhoea of grass trees.
• xenopsAny of the tropical birds in the genera Xenops, Megaxenops and Microxenops, found in Central and South America.
• xenusianAny lobopodian in the class †Xenusia.
• xyrisAny member of the plant genus Xyris.