名詞 brachium:

1. (biology) a branching or armlike part of an animal

bra.chi.um

n.（名詞）
【復數】 bra.chi.a[br3.kô-…, br2k.ô-…]
The part of the upper arm or forelimb extending from the shoulder to the elbow.
肱，上臂：從肩至肘之間的上臂部分或前肢
An arm or a homologous anatomical structure, such as a flipper or wing.
臂的同源結構：臂或同源的解剖結構，如鰭狀肢或翅膀
The part of a limb or process corresponding to an arm.
肱：肢的部分或臂上的隆起

來源：
Latin br3cchium [arm]
拉丁語 br3cchium [臂]
from Greek brakhiôn [upper arm] * see mregh-u-
源自 希臘語 brakhiôn [上臂] *參見 mregh-u-