胳肋底（粵拼：gaak3 laak1 dai2，「肋」陰平聲），國語叫腋窩。係人嘅身體部位，膊頭下面，身體同臂個骹位內側。大多數嘅中童或者成人都有啲毛喺胳肋底嗰度，叫胳肋底毛，不論男女，有多亦有少，細路就冇。
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