noun, takes genitive case の

  1. convex surface, convex.

Variations

Pronunciation Kanji Kana Is Common
凸面 とつめん

Contained Kanji Breakdown

convex, beetle brow, uneven
トツ でこ (9th, N1)
open box enclosure, open box radical (no. 17)
カン (Kentei 1)
mask, face, features
メン おも つら (3rd, N3)