| pter- | Ptero- Combining form meaning wing; feather. Origin: G. Pteron, wing, feather (05 Mar 2000) |
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| pteranodon | <paleontology> A genus of American Cretaceous pterodactyls destitute of teeth. Several species are known, some of which had an expanse of wings of twenty feet or more. Origin: Gr. Wing + priv. +, a tooth. Source: Websters Dictionary (01 Mar 1998) |
| pteranodontia | <paleontology> A group of pterodactyls destitute of teeth, as in the genus Pteranodon. Source: Websters Dictionary (01 Mar 1998) |
| pterichthys | <paleontology> A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See: Placodermi. Origin: NL, fr. Gr. Wing + fish. Source: Websters Dictionary (01 Mar 1998) |
| pteridine | Azinepurine; benzotetrazine; pyrazino[2,3-d]pyrimidine;a two-ring heterocyclic compound found as a component of pteroic acid and the pteroylglutamic acids (folic acids, pteropterin, etc.); simple pteridine derivatives (e.g., xanthopterin, leucopterin) occur as pigments in butterfly wings, whence the name. (05 Mar 2000) |
| pteridologist | One who is versed in pteridology. Source: Websters Dictionary (01 Mar 1998) |
| pteridology | <study> That department of botany which treats of ferns. Origin: Gr, a fern. Source: Websters Dictionary (01 Mar 1998) |
| pteridomania | <psychiatry> A madness, craze, or strong fancy, for ferns. Origin: Gr, a fern + E. Mania. Source: Websters Dictionary (01 Mar 1998) |
| Pteridophyta | <botany> Division of the plant kingdom that includes ferns, horsetails and clubmosses. (18 Nov 1997) |
| pteridophyte | <botany> Ferns. A major division of the plant kingdom, having clear alternation of generations with a dominant vascular sporophyte initially dependent upon the gametophyte which is very reduced. (12 Jan 1998) |
| 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) |
| 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) |