凸 (tū) - Convex & protruding

凸Tone 1

tū ｜ 5 strokes ｜ radical: 凵

婷婉

凸 · tū

Convex;

protruding;

bulging;

raised surface;

opposite of concave.

Convexprotrudingbulging

Usage highlights

Convex surfaceConvex lensConvex polygonConvex hullProtruding eyesConvex and concave

Synonyms

Antonyms

  • 凹— concave; sunken
  • 陷— sinking; depressed

Usage & contexts

Examples

  • The surface is convex (凸面).
  • A convex lens (凸透镜).
  • The terrain is uneven with bumps and hollows (凹凸不平).
  • Protruding belly (凸肚).

Collocations

  • Convex surface(凸面)
  • Convex lens(凸透镜)
  • Convex polygon(凸多边形)
  • Convex hull(凸包)
  • Protruding eyes(凸眼)
  • Convex and concave(凹凸)

Idioms

  • Uneven and rough(凹凸不平)
  • Protruding and sunken(凸凹有致)
  • Bumpy and rugged(崎岖凸凹)

Cultural background

FAQ
  • Used in mathematics and physics to describe curved surfaces and shapes.
  • In traditional Chinese aesthetics, the interplay of convex and concave (凹凸) represents balance and harmony.
  • Often appears in technical and scientific contexts rather than literary works.

FAQ