noun which may take the genitive case particle 'no', noun
convex shape; convex
Technical term used in geometry, optics, and engineering to describe a surface or shape that curves outward. Often contrasted with 凹形 (concave). The glosses 'cuspid' and 'gibbous' are rare or specialized; the core meaning is simply 'convex'.
See also: 凸型
Antonyms: 凹形
This lens has a convex shape.
Using a convex mirror lets you see a wide area.
concave shape; concavity
Compound of 凸 (convex) and 形 (shape). The kanji 凸 is a pictograph of a protruding shape, and 形 means form or shape. The reading とつけい is the on'yomi for both characters.