双凸面
Traditional form:
雙凸面
Pinyin (reading):
shuāngtūmiàn
Definitions:
- convex on both sides (of lens)
- biconvex
Characters:
- 双 - pair, couple; both; measure word for things that come in pairs
- 凸 - to protrude, to bulge out; convex
- 面 - face; surface, side; plane, dimension
Traditional characters: