| pterin | Term loosely used for any of the compounds containing pteridine; specifically, 2-amino-4-hydroxypteridine. Some pteridines (e.g., xanthopterin, leucopterin) still retain the pterin root. (05 Mar 2000) |
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| pterin deaminase | An aminohydrolase catalyzing hydrolytic deamination of 2-amino-4-hydroxypteridine to form 2,4-dihydroxypteridine and ammonia. (05 Mar 2000) |
| pterin-4a-carbinolamine dehydratase | <enzyme> Bifunctional protein which converts pterin-4a-carbinolamine to quinoid dihydrobiopterin and functions as dimerization cofactor for hnf-1alpha; deficiency results in an atypical form of phenylketonuria; proposed EC 4.2.1.96 Registry number: EC 4.2.1.- Synonym: pt-c dehydratase, phenylalanine hydroxylase-stimulating protein, pterin-4alpha-carbinolamine dehydratase, dcoh protein, dimerization cofactor of hnf-1alpha, 4a-hydroxytetrahydrobiopterin dehydratase, 4a-carbinolamine dehydratase, bh3oh dehydratase, 4alpha-carbinolamine dehydratase (26 Jun 1999) |
| pterion | A craniometric point in the region of the sphenoid fontanelle, at the junction of the greater wing of the sphenoid, the squamous temporal, the frontal, and the parietal bones; it intersects the course of the anterior division of the middle meningeal artery. Origin: G. Pteron, wing (05 Mar 2000) |
| pterobranchia | <zoology> An order of marine Bryozoa, having a bilobed lophophore and an axial cord. The genus Rhabdopleura is the type. Synonym: Podostomata. See: Rhabdopleura. Origin: NL, fr. Gr. A wing +. Source: Websters Dictionary (01 Mar 1998) |
| pteroceras | <zoology> A genus of large marine gastropods having the outer border of the lip divided into lobes. Synonym: scorpion shell. Origin: NL, fr. Gr. A wing + a horn. Source: Websters Dictionary (01 Mar 1998) |
| pterocletes | <ornithology> A division of birds including the sand grouse. They are in some respects intermediate between the pigeons and true grouse. Synonym: Pteroclomorphae. Origin: NL, fr Pterocles, the typical genus, fr. Gr. Feather +, a key, tongue of a clasp. Source: Websters Dictionary (01 Mar 1998) |
| pterodactyl | <paleontology> An extinct flying reptile; one of the Pterosauria. Origin: Gr. A wing + finger, toe: cf. F. Pterodactyle. Source: Websters Dictionary (01 Mar 1998) |
| pterodactyli | <paleontology> Same as Pterosauria. Source: Websters Dictionary (01 Mar 1998) |
| pteroglossal | <zoology> Having the tongue finely notched along the sides, so as to have a featherlike appearance, as the toucans. Origin: Gr. A feather + tongue. Source: Websters Dictionary (01 Mar 1998) |
| pteroic acid | A constituent of folic acid, containing p-aminobenzoic acid and pteridine linked by a -CH2-group between the amino group of the former and C-6 of the latter. (05 Mar 2000) |
| pteron | <anatomy> The region of the skull, in the temporal fossa back of the orbit, where the great wing of the sphenoid, the temporal, the parietal, and the frontal hones approach each other. Origin: NL, fr. Gr. A wing. Source: Websters Dictionary (01 Mar 1998) |
| pteropappi | <zoology> Same as Odontotormae. Origin: NL, from Gr. A feather, a bird + a grandfather. Source: Websters Dictionary (01 Mar 1998) |
| pterophore | <zoology> Any moth of the genus Pterophorus and allied genera; a plume moth. See: Plume moth, under Plume. Origin: Gr. A feather + to bear. Source: Websters Dictionary (01 Mar 1998) |
| pteropod | <zoology> One of the Pteropoda. Origin: Gr. Wing-footed; a feather, wing +, foot: cf. F. Pteropode. Source: Websters Dictionary (01 Mar 1998) |