Synonym: eponychium. ... Origin: peri-+ G. Onyx, nail ... (05 Mar 2000) ... 
(per″e-o-nik´e-әm) cuticle.
Type: Term Pronunciation: per′ē-ō-nik′ē-ŭm, -nik′ē-ă Synonyms: eponychium1
Perionychium: The tissue surrounding the nail, whether it be a fingernail or a toenail, including the tissue bordering the root and sides of the nail. The word is composed of 'peri-' meaning around or surrounding + the Greek word 'onyx' for nail = around the nail.
perionychium (s), perionychia (pl) 1. The tissue surrounding the nail, whether it be a fingernail or a toenail, including the tissue bordering the root and sides of the nail. 2. The border of epidermal tissue surrounding a fingernail or toenail.