Relating to or situated in the armpit or the angle between a leaf and the stem of a plant.
From Latin 'axilla' (armpit) + '-ary' suffix meaning 'of or pertaining to.' Used in both anatomy and botany since the 18th century.
The axillary artery and axillary lymph nodes are so important that surgeons must carefully preserve them during arm surgery—cutting the wrong structure there can affect arm function for life.
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