1. 咯肢窝, 腋窝：diving bird 潜鸟 | axilla 咯肢窝, 腋窝 | pulverized corundum 刚玉砂, 金刚砂粉

2. 腋：limb,extremity 肢 | axilla 腋 | arm 臂

3. 咯肢窝：axileepaxial 轴上的 | axilla 咯肢窝 | axillary 叶腋的

noun

1. the hollow under the arm where it is joined to the shoulder

e.g. they were up to their armpits in water

Synonym: armpitaxillary cavityaxillary fossa