| pygomelus | Unequal conjoined twins in which the parasite is represented by a fleshy mass, or by a more fully developed limb, attached to the sacral or coccygeal region of the autosite. See: conjoined twins. Origin: pygo-+ G. Melos, part (05 Mar 2000) |
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| pygopagus | Conjoined twins in which the two individuals are joined at the buttocks, most often back to back. See: conjoined twins. Origin: pygo-+ G. Pagos, something fixed (05 Mar 2000) |
| pygopod | 1. <zoology> One of the Pygopodes. 2. <zoology> Any species of serpentiform lizards of the family Pygopodidae, which have rudimentary hind legs near the anal cleft, but lack fore legs. Origin: Gr. Rump + -pod. Source: Websters Dictionary (01 Mar 1998) |
| pygopodous | <zoology> Of or pertaining to the Pygopodes. Source: Websters Dictionary (01 Mar 1998) |
| pygostyle | <anatomy> The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebrae, and supports the uropigium. Origin: Gr. The rump + a pillar. Source: Websters Dictionary (01 Mar 1998) |
| pygotartaric | <chemistry> Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid. Origin: Pyro- + tartaric. Source: Websters Dictionary (01 Mar 1998) |
| pygropodes | <ornithology> A division of swimming birds which includes the grebes, divers, auks, etc, in which the legs are placed far back. Source: Websters Dictionary (01 Mar 1998) |
| pyin | <physiology> An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body. Origin: Gr. Pus. Source: Websters Dictionary (01 Mar 1998) |
| pykar | An ancient English fishing boat. Source: Websters Dictionary (01 Mar 1998) |
| pyknic | Denoting a constitutional body type characterised by well rounded external contours and ample body cavities; virtually synonymous with endomorphic. Origin: G. Pyknos, thick (05 Mar 2000) |
| pykno- | Thick, dense, compact. Origin: G. Pyknos (05 Mar 2000) |
| pyknodysostosis | <radiology> Autosomal recessive, dense, sclerotic bones [Cf: osteopetrosis (sporadic, not inherited)] Features: open cranial sutures and fontanelles, Wormian bones, dolichocephaly, sclerotic vertebrae, fractured long bones, short, stubby hands, partial agenesis/aplasia of terminal phalanges [simulates acro-osteolysis] (12 Dec 1998) |
| pyknoepilepsy | An obsolete terms for absence. Origin: pykno-+ G. Lepsis, seizure. (05 Mar 2000) |
| pyknolepsy | A generalised epilepsy syndrome characterised by the onset of absence seizures in childhood, typically at age six or seven years. There is a strong genetic predisposition and girls are affected more often than boys. EEG reveals generalised 3 Hz spike-wave activity on a normal background. Prognosis for remission is good if the patient does not also have generalised tonic-clonic seizures. See: absence. Synonym: petit mal epilepsy, pyknolepsy. (05 Mar 2000) |
| pyknomorphous | Denoting a cell or tissue that stains deeply because the stainable material is closely packed. Origin: pykno-+ G. Morphe, form, shape (05 Mar 2000) |