the hollow under the arm where it is joined to the shoulder;
"they were up to their armpits in water"
例句
用作名词(n.)
Proper placement of the axillary roll is under the thorax caudad to the axilla.腋窝卷的正确使用方法，是放在腋窝的尾端的胸廓下。
Supporting the patient's arm during the axillary examination allows the arm to be fully relaxed so that nodes deep within the axilla can be palpated.腋下检查时，支撑病人手臂，使其充分放松，这样就可以摸到腋窝深处的淋巴结。
