axil

名词 axil:

1. the upper angle between an axis and an offshoot such as a branch or leafstalk

ax.il

n.（名词）
The upper angle between a lateral organ, such as a leafstalk, and the stem that bears it.
腋：在侧部器官如叶柄和支撑着它的叶梗之间的上角

来源：
Latin axilla [armpit]
拉丁语 axilla [腋窝]