| piebald eyelash | An isolated bundle of white eyelash's among normally pigmented eyelash's. Synonym: canities circumscripta, ciliary poliosis, poliosis. (05 Mar 2000) |
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| piebald skin | Patchy absence of the pigment of scalp hair, giving a streaked appearance; patches of vitiligo may be present in other areas sue to absence of melanocytes; often transmitted as an autosomal dominant trait and may be associated with neurological defects or eye changes . Compare: Waardenburg syndrome. Synonym: piebald skin, piebaldism. (05 Mar 2000) |
| piebaldism | Autosomal dominant, congenital disorder characterised by localised hypomelanosis of the skin and hair. The most familiar feature is a white forelock presenting in 80 to 90 percent of the patients. The underlying defect is possibly related to the differentiation and migration of melanoblasts, as well as to defective development of the neural crest (neurocristopathy). Piebaldism may be closely related to waardenburg's syndrome. (12 Dec 1998) |
| piebaldness | Patchy absence of the pigment of scalp hair, giving a streaked appearance; patches of vitiligo may be present in other areas sue to absence of melanocytes; often transmitted as an autosomal dominant trait and may be associated with neurological defects or eye changes . Compare: Waardenburg syndrome. Synonym: piebald skin, piebaldism. (05 Mar 2000) |
| piece | A part or portion. End piece, a part of the spermatozoon consisting of an axoneme surrounded only by the flagellar membrane. (05 Mar 2000) |
| pied | Variegated with spots of different colours; party-coloured; spotted; piebald. "Pied coats." . "Meadows trim with daisies pied." . Pied antelope, a common European flycatcher (Ficedula atricapilla). The male is black and white. Origin: From Pie the party-coloured bird. Source: Websters Dictionary (01 Mar 1998) |
| piedmont | <geology> Noting the region of foothills near the base of a mountain chain. Origin: F. Pied foot + mont mountain. Source: Websters Dictionary (01 Mar 1998) |
| piedmont fracture | <radiology> Closed fracture of radius, at the junction of the middle and distal thirds, no associated ulnar fracture, due to direct blow (12 Dec 1998) |
| piedmontite | <chemical> A manganesian kind of epidote, from Piedmont. See Epidote. Source: Websters Dictionary (01 Mar 1998) |
| piedra | Either of two diseases resulting from fungal infection of the hair shafts. Black piedra occurs mainly in and on the hairs of the scalp and is caused by piedraia hortae; white piedra occurs in and on the hairs of the scalp, beard, moustache and genital areas and is caused by trichosporon beigelii. (12 Dec 1998) |
| piedra nostras | A condition similar to piedra, but affecting the hair of the beard. (05 Mar 2000) |
| Piedraia | A genus of fungi, based on Piedraia hortae, which is probably the only species and which causes black piedra. Origin: see piedra (05 Mar 2000) |
| pieds terminaux | Synonym: axon terminals. Origin: Fr., end feet (05 Mar 2000) |
| pieplant | <botany> A plant (Rheum Rhaponticum) the leafstalks of which are acid, and are used in making pies; the garden rhubarb. Source: Websters Dictionary (01 Mar 1998) |
| pierce | To enter; to penetrate; to make a way into or through something, as a pointed instrument does; used literally and figuratively. "And pierced to the skin, but bit no more." (Spenser) "She would not pierce further into his meaning." (Sir P. Sidney) Source: Websters Dictionary (01 Mar 1998) |