Luokka Biologiabulgariaenglantiespanjaesperantohollantiitaliajapanikreikkalatinalatvialiettuanorjaportugalipuolaranskaruotsisaksasuomitanskaturkkitšekkiunkarivenäjäviro

tubuloalveolar turbellarian type type collection type species UIgG ultrastructure umbo unarmed uncoating underexcretion undifferentiated undulipodium ungual unguiculate unguinal unicellular uniflagellate uniform distribution unigenous unikont unilamellar uninjected uninucleated unipotent unipupilled univoltine unspecialized upregulate upstream urbilaterian uredinium urochord uterovaginal

vacuolation vagile vagility valve valvular variable varietal vasiform vasomodulation VCO₂ vector vegetality vegetative versatile vesicomyid vessel vestige vestigial vestigial structure vestimentiferan vestiture viable vicariance vigour villi villiform villous villus violacein virescence virgin birth virilescent virilize

viropexis viruliferous vital capacity vital function vitellary vitelligene vitellus viviparous viviparously viviparousness voltinism VOx warning coloration washout wayfinding wild type winterer witchweed wood parenchyma xanthochrome xanthochromism xanthophore xanthophyte xenobiont xenobiotic xenofree xenogenesis xenophora xenophyte xenotropic xeromorphic xylophage xylophagia