See: pilus.
Pili multigemini, the presence of several hairs in a single follicle.
R pili, specialised pili found on bacterial cells, similar to F pili and associated with R plasmids.
Pili torti, a condition in which many hair shafts are twisted on the long axis, congenital or acquired as a result of distortion of the follicles from a scarring inflammatory process, mechanical stress, or cicatrizing alopecia; the hair shafts resemble spangles in reflected light, are brittle, and break at varying lengths with many areas appearing bald with a dark stubble; as a developmental defect it can be manifested in such syndromes as Bjornstad's, Crandall's, and Menkes'.
Synonym: twisted hairs.
(05 Mar 2000)