突とっ起き物ぶつ

noun

protuberance; protruding object

General term for something that sticks out from a surface; used in everyday and technical contexts.

• この壁かべには小ちいさな突とっ起き物ぶつがいくつかある。

  There are several small protrusions on this wall.

noun

umbo

Biology term for a knob-like protuberance, such as on a shell or spore.

• この貝かい殻がらの突とっ起き物ぶつはウンボと呼よばれる。

  The protrusion on this shell is called an umbo.