noun
thumb; pollex
Anatomical term for the thumb. In everyday language, 親指 (おやゆび) is more common.
拇指は他の指と向かい合うことができる。
The thumb can oppose the other fingers.
解剖学では、拇指を第一指と呼ぶ。
In anatomy, the thumb is called the first digit.
From Chinese 拇指 (mǔzhǐ), combining 拇 ('thumb') and 指 ('finger'). The reading ぼし is the on'yomi of the characters.