Word origins

• nuttalliasisbabesiosis
• nymphaeidA plant rooted in the bottom, but with leaves floating on the water surface.
• nymphoidOf or pertaining to a nymph.
• Oaxaca mud turtleA Mexican mud turtle of species Kinosternon oaxacae.
• obscure honeyeaterCaligavis obscura, a honeyeater species found in New Guinea.
• ochnaAny of the genus Ochna of evergreen trees, shrubs and shrublets.
• ochodaeidAny beetle in the family Ochodaeidae.
• ocimeneAny of several isomeric monoterpenes found in many plants
• octocoralAn anthozoan of the subclass Alcyonaria, having eight-branched tentacles and eight septa.
• odd-toed ungulateAny mammal in the order Perissodactyla, including horses and other equids, rhinoceroses, and tapirs.
• odonateAny carnivorous insect of the order Odonata; a dragonfly or damselfly.
• odontoceteAny member of the cetacean parvorder Odontoceti; a toothed whale.
• oenanthotoxinA toxin found in hemlock water dropwort, Oenanthe crocata, and other plants of the genus Oenanthe.
• omnivoropteryxAny primitive bird of the genus Omnivoropteryx.
• omphalinoidDescribing any mushroom with decurrent gill attachment, a cartilaginous stem, a broad or depressed cap surface and lacking an annulus and volva.
• onosmaAny flowering plant of the genus Onosma, of the family Boraginaceae.
• onychiuridAny springtail of the family Onychiuridae
• onychophoranAny of many wormlike carnivorous ecdysozoan animals of the phylum Onychophora.
• onygenaleanOf or pertaining to the fungal order Onygenales.
• oonopidAny spider in the family Oonopidae.
• opegraphaAny lichen species of the genus Opegrapha.
• ophionAny ichneumon wasp of the genus Ophion.
• opiineA braconid wasp of the subfamily Opiinae
• ornithomimusAny relatively small theropod dinosaur of the genus †Ornithomimus, the first genus of the ornithomimids to be described.
• ornithorhynchusA platypus (genus Ornithorhynchus).
• ornithothoracineAny avialan of the clade Ornithothoraces
• ornithurineA bird of the clade Ornithurae.
• orthaganAny pyralid moth of the genus Orthaga.
• orthosiphonAny herbaceous shrub of the genus Orthosiphon.
• ostryopsitriolA cyclic diarylheptanoid found in the plant Ostryopsis nobilis.
• oudemansinAny of a class of organic compounds isolated from Oudemansiella fungi.
• ourisiaAny plant of the genus Ourisia.
• ovalentarianAny fish of the clade Ovalentaria, in the clade Percomorpha.
• owlet mothAny moth of the family Noctuidae.
• oxylobiumAny leguminous plant of the genus Oxylobium, also commonly called shaggy peas.
• oxytropeSynonym of locoweed.
• oxyuricidalDestructive to worms of the genus Oxyuris, or pinworms.
• pachybrachineAny beetle of the chrysomelid tribe Pachybrachini (subtribe Pachybrachina in some classifications).
• pachycephalosaurAny of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.
• pachycephalosaurusAny of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.
• pachychilidAny freshwater snail in the family Pachychilidae.
• pachyptileAny seabird in the genus Pachyptila.
• pacuvirusAny virus of the genus Pacuvirus
• paguridAny of the hermit crabs of family Paguridae, a right-handed hermit crab.
• palaeocastoridAny extinct prehistoric beaver of the genus †Palaeocastor.
• pallidolA resveratrol dimer found in Cissus pallida etc.
• palmellinA pigment found in the alga Porphyridium purpureum (formerly Palmella cruenta).
• paludinaAny of numerous species of freshwater pectinibranchiate mollusks, sea snails belonging to Viviparus (syn. Paludina), Melantho, and allied genera in family Viviparidae, with operculated shells, usually green, often with brown bands.
• panchaxAny of various tropical fish in the cyprinodontiform families Aplocheilidae and Nothobranchiidae which were formerly classified in the genus Panchax.
• ParadysThe star α Apodis in the constellation Apus.
• parahoxozoanAny marine animal of the superphylum Parahoxozoa
• parisaponinA particular steroid glycoside.
• parnassiaAny of the genus Parnassia of herbaceous dicots.
• parotiaAny of the birds in the genus Parotia, found in New Guinea.
• patrician blueLepidochrysops patricia, a species of blue-winged butterfly in the family Lycaenidae found in South Africa.
• paussineAny member of the subfamily Paussinae of ground beetles, most of which live as predators in ants' nests.
• peganineSynonym of vasicine.
• peracaridAny crustacean of the superorder Peracarida.
• perciformOf or pertaining to any of very many fish, of the order Perciformes, that have fin spines, a swim bladder without a duct, usually ctenoid scales, and 17 or fewer caudal fin rays.
• perezoneA sesquiterpene quinone found in various Perezia species.
• perichelydianAny reptile of the clade Perichelydia.
• persooniaA plant of the genus Persoonia.
• pestivirusAny of several viruses, of the genus Pestivirus, that infect cattle, sheep, pigs etc.
• petroicidOf or relating to the passerine family Petroicidae.
• peucedanumAny apiaceous plant of the genus Peucedanum.
• pezizinAn orange-yellow pigment found in Peziza species.
• phagnalonAny plant of the genus Phagnalon
• phascogaleAny of several Australian dasyurid marsupials, of the genus Phascogale, the males of which die shortly after mating.
• phaseomanniteinositol
• phasmatidAny stick insect in the family Phasmatidae.
• philentomaAny of the birds in the genus Philentoma, found in parts of South East Asia.
• pholidoteA member of the Pholidota; a pangolin.
• phoridAny fly of the family Phoridae.
• phylicaAny of the flowering plants of the genus Phylica, the majority of which are restricted to South Africa.
• phyllidiidAny sea slug in the family Phyllidiidae.
• phyllostomephyllostomid
• phyllostomidAny bat of the family Phyllostomidae, having large, lance-shaped noses; a leaf-nosed bat.
• picarianOf or relating to the Picariae, an obsolete bird classification.
• picrasminAn organic compound found in Jamaican quassia.
• pictumineA diterpenoid alkaloid found in Delphinium pictum.
• Pincoya storm petrelOceanites pincoyae, a species of storm petrel native to a small coastal region of Chile.
• pingyangmycinAn antitumor glycopeptide antibiotic belonging to the bleomycin family, produced by Streptomyces verticillus var. pingyangensis.
• pipritesAny of the tropical birds in the genus Piprites, found in Central and South America.
• piptocarphinAny of a group of sesquiterpenes present in Piptocarpha
• pisoniaAny of the genus Pisonia of nyctaginaceous flowering plants.
• planarianAny of various flatworms of the order Tricladida living in marine, freshwater, or terrestrial environments.
• platygastridAny wasp in the family Platygastridae.
• plesiosaurAny of the order †Plesiosauria of extinct marine reptiles, from the Jurassic and Cretaceous periods.
• pleurostictAny lichen of the genus Pleurosticta
• plumericinA certain naturally-occurring tetracyclic spirolactone iridoid found in Plumeria.
• pneumovirusAny virus of the genus Pneumovirus or of the family Pneumoviridae.
• pochoninA radicicol produced by Pochonia or Humicola.
• poeciliidAny fish in the family Poeciliidae.
• polistineAny of the wasps of the subfamily Polistinae.
• polygyridAny snail in the family Polygyridae.
• pomaderrisAny plant of the genus Pomaderris.
• pomatiopsidAny member of the family Pomatiopsidae of saline lake gastropods.
• pontic rhododendronAny member of the species Rhododendron ponticum of large evergreen shrubs, natively found in the Iberian Peninsula and Caucasus region.
• pottioidResembling the moss genus Pottia.
• prismatomerinA cytotoxic iridoid found in Prismatomeris tetrandra.