noun
long arm; monkey arm
Formal or literary term for an unusually long arm, often likened to a monkey's arm. Rare in everyday speech.
彼は猿臂を生かして遠くの物を取った。
He used his long arms to grab something far away.
Compound of 猿 (monkey) and 臂 (arm). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning of a long, monkey-like arm.