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 PTC Phenylthiocarbamide. ptdna plasma tumor DNA ptenoglossan Any sea snail of the clade Ptenoglossa. ptenoglossate Of or pertaining to the Ptenoglossa. pteranodon A member of Pteranodon, a genus of large pterosaurs, the males of which had a bony crest on the back of the head. pteranodontian Any ornithocheiroid pterosaur of the clade Pteranodontia pteranodontid Any pterosaur in the family Pteranodontidae. pteranodontoid Any pterosaur of the clade †Pteranodontoidea. pterapophysis A ridge or lamina across the lateral surface of the neural spine of some snakes pteraspid Synonym of pteraspidid. pteraspidid Any extinct jawless fish of the family †Pteraspididae pteraspidomorph Any member of the Pteraspidomorphi, an extinct class of early jawless fish. pterasterid Any sea star of the family Pterasteridae Pterelas King of the Teleboans in Plautus' Amphitruo. ptereleotrid Any fish in the family Ptereleotridae, the dartfishes. pteric Relating to a wing. pteridaceous Of or relating to the Pteridaceae. pteridin Any erniettomorph of the genus Pteridinium pteridine A bicyclic aromatic heterocycle consisting of fused pyrimidine and pyrazine rings. pteridinyl The functional group derived from pteridine. pteridium A fern of the genus Pteridium. pteridography The scientific description of ferns. pteridoid Any fern of the subfamily Pteridoideae pteridological Relating to pteridology. pteridologist A person who studies ferns and other pteridophytes. pteridology The scientific study of ferns and other pteridophytes. pteridomania A craze, in 19th-century England, for collecting ferns and for using images of ferns in the decorative arts pteridophobia The fear of ferns. pteridophyte Any plant of the division Pteridophyta, of simple vascular plants that reproduce via spores rather than seeds and that alternate generations of diploid (sporophyte) and haploid (gametophyte or prothallus) forms, the diploid generally being larger and more conspicuous. pteridophytic Of or pertaining to the ferns of the division Pteridophyta. pteridosperm Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing seeds instead of spores pteridospermatophyte Synonym of pteridosperm. pteridospermous Of or pertaining to the pteridosperms. pteriid Any clam of the family Pteriidae. pterin A ketonic amide derivative of pteridine responsible for some of the colouring in nature. It is also a component of folic acid. pterineid Any bivalve of the extinct family Pterineidae. pterinic Pertaining to, or containing, a pterin pterinosome A cytoplasmic organelle that makes and stores pteridine pigments pterioid Any marine bivalve of the superfamily Pterioidea pterioidean Any bivalve mollusc of the superfamily Pterioidea pteriomorph Relating to or characteristic of the pteriomorphians pteriomorphian Any bivalve mollusc of the subclass Pteriomorphia pterion The point corresponding with the posterior end of the sphenoparietal suture; known as the weakest part of the skull. pterionic Relating to the pterion pterippus A winged horse; Pegasus. pterobranch Any filter feeder of the class Pterobranchia pterocardiac winglike and present in the cardiac stomach pterocarpan Any of various isoflavonoid derivatives found in the Fabaceae family pterocarpanoid A derivative of a pterocarpan pterocarpanquinone The naphthoquinone (2S,10S)-3,12-dioxapentacyclo[11.8.0.02,10.04,9.015,20]henicosa-1(13),4,6,8,15,17,19-heptaene-14,21-dione that has antileishmanial activity pterocarpin A pterocarpan, 3-methoxy-8,9-methylenedioxypterocarpan, present in camwood pterocarpous Having winged fruit. pterochorous Having "wings" that are used for dispersal by the wind pteroclid Any bird in the family Pteroclidae; a sandgrouse. pterocommatine Any aphid of the tribe Pterocommatini pterodactyl A pterosaur of the genus Pterodactylus. pterodactylane A small, substituted ladderane supposed to have the form of a pterodactyl pterodactylic Of, like, or pertaining to a pterodactyl. pterodactylid Any pterosaur in the family Pterodactylidae. pterodactyllike Resembling or characteristic of pterodactyls. pterodactyloid Any pterosaur of the suborder Pterodactyloidea pteroenone A hydroxyketone synthesized by Clione species as a defense against being eaten. pterographic Relating to pterography. pterographical Relating to pterography. pterography The scientific description of feathers. pteroid A bone, found only in pterosaurs, that connected to the wrist to support the propatagium. pterology The study of insects' wings. pterolysis The arrangement of different feathers in different parts of a bird pteroma A walkway, in a Greek or Roman temple, between the cella and surrounding colonnade. pteromalid Any member of the family Pteromalidae of parasitic wasps. pteromaloid Relating to the pteromalids pteromechanophobia Fear of flying. pteromerhanophobia Fear of flying. pteron A peristyle raised on a podium, differing from an ordinary peristyle raised only on a stylobate. pteronarcyid Any stonefly in the family Pteronarcyidae. pteronophobia The fear of feathers. pteronyssid Any mite in the family Pteronyssidae. pterophore Any moth of Pterophorus and allied genera; a plume moth. pterophorid Any moth of the family Pterophoridae. pterophyte Any fern (of division Pteridophyta). pteropid Any bat of the former family Pteropidae; the fruit bats pteropine of or pertaining to flying foxes (bats of the genus Pteropus). pteropleural Related to the pteropleuron. pteropleuron Synonym of anepimeron. pteropod Any of free-swimming pelagic sea snails and sea slugs, of the suborder Thecosomata, that have winglike lobes on the feet; a sea butterfly. pteropodid Any of the bat family Pteropodidae. pteropodine Of or pertaining to the flying foxes and similar bats of the subfamily Pteropodinae pteropodous Of or pertaining to the obsolete group Pteropoda, the pteropods. pteropsin A non-visual opsin present in some winged insects pteroptochid Any bird in the family Pteroptochidae, a synonym of the Rhinocryptidae; a tapaculo. pterorhodin A red pigment in the melanophores of tree frogs. pterosaur Any flying reptile, of the extinct order †Pterosauria, including the pterodactyls. pterosaurian Of, like, or pertaining to a pterosaur. pterosaurlike Resembling or characteristic of pterosaurs. pterosauromorph Any extinct reptile of the clade Pterosauromorpha pterosaurus Synonym of pterosaur. pterosin Any of a group of indanone derivatives present in bracken of the genus Pteridium. pterospermous Having winged seeds. pterosphenoid Either of a pair of endochondral bones in the skull of some fish pterostigma A spot on the outer wing of insects which is often thickened or coloured and so stands out from the rest; it is a group of specialized cells and has an effect on flight dynamics. pterostigmal Relating to a pterostigma pterostigmatic Relating to pterostigmata pterostilbene A stilbenoid chemically related to resveratrol. pterothecid Any extinct mollusk in the family Pterothecidae. pterothoracic Relating to a pterothorax pterothorax The mesothorax and metathorax of an insect pterotic Of or relating to a bone between the prootic and epiotic in the dorsal and outer part of the periotic capsule of many fishes. pterotillomania A behavioural disorder in birds in which a bird plucks out its own feathers, or plucks the feathers of its chicks. pterotracheid Any gastropod in the family Pterotracheidae. pteroyl A univalent polycyclic heterocyclic acyl radical derived from pteroyl acid pteroylaspartic Designating an antimetabolite acid used in treating cancers. pteroylglutamic Describing an amino acid in the vitamin B complex; folic (as in pteroylglutamic acid). pterror Synonym of orange baboon tarantula. Pterry Nickname for Terry Pratchett (1948–2015), English author. pteruge A flexible feather-like strip of material at the edge of body or head armour, particularly used in Greco-Roman times, such as the flaps of a linothorax or the strips hanging from a Roman legionary's belt. pterulaceous Of or relating to the Pterulaceae. pterygial Of or pertaining to the pterygium pterygiate Having a pterygium or pterygia. pterygiophore Any of the bones in a fish that support the dorsal fin. There are two to three of them: proximal, middle, and distal. In spinous fins the distal is often fused to the middle or not present at all. pterygium An abnormal mass of tissue in the corner of the eye that obstructs vision. pterygocranial pterygoid and cranial pterygoid Of, pertaining to or lying in the region of the inferior part of the sphenoid bone of the vertebrate skull. pterygoidal Relating to a pterygoid (bone) pterygomaxillary Of or pertaining to the pterygoid process of the sphenoid bone and the maxilla. pterygometopid Any trilobite in the family Pterygometopidae. pterygopalate Synonym of pterygopalatine. pterygopalatine Of or pertaining to the pterygoid process of the sphenoid bone and the palatine bone. pterygoparoccipital pterygoid and paroccipital pterygopodium A modified part of the pelvic fin in male elasmobranchs, which serves as a copulatory organ pterygoquadrate Of or relating to the pterygoid and quadrate bones or cartilages. pterygostomial Relating to the anteroventral region of the carapace of a crustacean. pterygote Any insect of the order Pterygota. pterygotid Any eurypterid in the family Pterygotidae. pterygotioid Any member of the Pterygotioidea superfamily of extinct eurypterids pterygotoid Any member of the Pterygotioidea superfamily pteryla One of the areas of a bird's skin on which feathers grow. pterylographic Relating to pterylography. pterylographical Relating to pterylography. pterylographically In terms of pterylography. pterylography The study or description of the arrangement of feathers, or of the pterylae, of birds. pterylological Of or relating to pterylology. pterylology The study of distribution of feathers on birds. pterylosis The particular arrangement of feathers on a bird. ptesculentoside A norsesquiterpenoid glucoside present in the bracken Pteridium esculentum PTHC preteen hardcore pthiriasis Phthiriasis. ptilichthyid Any fish in the family Ptilichthyidae. ptiliid Any beetle in the family Ptiliidae. ptilinal Relating to the ptilinum ptilinum A bladder-like pouch on the head of schizophoran flies that by expanding enables the fly to emerge from its puparium.