ao1
tu1
  1. concave or convex
  2. bumps and holes
  3. uneven (surface)
  4. rugged

Characters

  • 凹 (凹): concave; depressed; sunken; indented; female (connector etc)
  • 凸 (凸): to stick out; protruding; convex; male (connector etc); Taiwan pr. [tu2]

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