The armpit; the area under the arm where it joins the body, including the space and tissues in that region.
From Latin 'axilla' meaning armpit, possibly related to 'axis' (axis) as the point of rotation of the arm. The term has been used in anatomy since Roman times.
Your armpit contains a busy intersection of nerves, blood vessels, and lymph nodes—it's medically interesting because cancer cells often spread there first, making it crucial for doctors to check during exams.
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