| piloid gliosis | An area of chronic, reactive astrocytosis composed of thin, hairlike cells in vaguely parallel array. (05 Mar 2000) |
|---|---|
| pilojection | Process of shooting shafts of stiff mammalian hair into a saccular aneurysm in the brain in order to produce thrombosis. Origin: pilo-+ injection (05 Mar 2000) |
| pilomatrixoma | A tumour composed of cells resembling those of the hair matrix, which undergo 'mummification' and may calcify. It is a relatively uncommon tumour, which may occur at any age from infancy. The majority of patients are under 20, and females are affected more than males. The lesion is usually a solitary deep dermal or subcutaneous tumour 3-30 mm in diameter, situated in the head, neck, or upper extremity. (12 Dec 1998) |
| pilomotor | Moving the hair; denoting the arrectores pilorum muscles of the skin and the postganglionic sympathetic nerve fibres innervating these small smooth muscles. Origin: pilo-+ L. Motor, mover (05 Mar 2000) |
| pilomotor fibres | Nerve fibre's that innervate the erector muscles of hair follicles responsible for piloerection. (05 Mar 2000) |
| pilomotor reflex | Contraction of the smooth muscle of the skin resulting in "gooseflesh" caused by mild application of a tactile stimulus or by local cooling. (05 Mar 2000) |
| pilon fracture | A fracture of the distal metaphysis of the tibia extending into the ankle joint. (05 Mar 2000) |
| pilonidal | Denoting the presence of hair in a dermoid cyst or in a sinus opening on the skin. Origin: pilo-+ L. Nidus, nest (05 Mar 2000) |
| pilonidal cyst | A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. (12 Dec 1998) |
| pilonidal fistula | A dimple in the crease between the buttocks. (12 Dec 1998) |
| pilonidal sinus | A dimple in the crease between the buttocks. (12 Dec 1998) |
| pilose | Hairy, the hairs soft and clearly separated but not sparse. (09 Oct 1997) |
| pilosebaceous | Relating to the hair follicles and sebaceous glands. Origin: pilo-+ L. Sebum, suet (05 Mar 2000) |
| pilosis | Synonym: hirsutism. Origin: pilo-+ G. -osis, condition (05 Mar 2000) |
| pilot | 1. One employed to steer a vessel; a helmsman; a steersman. 2. Specifically, a person duly qualified, and licensed by authority, to conduct vessels into and out of a port, or in certain waters, for a fixed rate of fees. 3. Figuratively: A guide; a director of another through a difficult or unknown course. 4. An instrument for detecting the compass error. 5. The cowcatcher of a locomotive. Pilot balloon, a small balloon sent up in advance of a large one, to show the direction and force of the wind. Pilot bird. <medicine> Same as Blackfish. Origin: F. Pilote, prob. From D. Peillood plummet, sounding lead; peilen, pegelen, to sound, measure (fr. D. & G. Peil, pegel, a sort of measure, water mark) + lood lead, akin to E. Lead. The pilot, then, is the lead man, i.e, he who throws the lead. See Pail, and Lead a metal. Source: Websters Dictionary (01 Mar 1998) |