| 释义 |
poliosis Med.|pɒliːˈəʊsɪs|
[mod.L., f. Gr. πολι-ός grey + -osis.]
Partial or general greyness or whiteness of the hair, esp. if premature.
1813T. Young Introd. Med. Lit. lxiv. 370 Spilosis, discolorations of the skin, or of the cuticular substances, without constitutional disease... S. poliósis, grey hairs. 1817J. M. Good Physiol. Syst. Nosology 501 Poliósis, hairs prematurely grey or hoary. Poliosis, auct. var. 1868Jrnl. Cutaneous Med. I. 277 Poliosis, or canities, was present in 9 cases in the two thousand... The white hairs were pretty uniformly dispersed through the rest of the hair, giving rise to incipient greyness. 1940Becker & Obermayer Mod. Dermatol. & Syphilol. xxx. 531/1 Poliosis is definitely hereditary, and..is due to complete lack of pigment function. 1968Ebling & Rook in A. Rook et al. Textbk. Dermatol. II. xlvi. 1414/2 Poliosis results from absence or deficiency of melanin in a group of neighbouring hair follicles. Clinically it presents as a strand or mesh of white hairs. |