/ˈlimbəs/
Noun, pl. limbi
1. Border or edge of an anatomical part. (wikipedia.org)
2. The border or margin of a structure, esp. the junction of the cornea and sclera in the eye. (Google Dictionary)
3. A border or edge of any of various body parts distinguished by color or structure. (wordnetweb.princeton.edu)
Word origin: Latin, literally “edge, border.”