limbus

名词 limbus:

1. a border or edge of any of various body parts distinguished by color or structure

lim.bus

n.（名词）
【复数】 lim.bi[-bo.] 【生物学】
A distinctive border or edge, such as the junction between the cornea and sclera of the eyeball.
缘，边缘：明显的边缘或界限，如眼睛角膜周围与巩膜连接的部分

来源：
Latin [border]
拉丁语 [边界]