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|Noun||1.||axillary cavity - the hollow under the arm where it is joined to the shoulder; "they were up to their armpits in water"|
arteria axillaris, axillary artery - the part of the main artery of the arm that lies in the armpit and is continuous with the subclavian artery above and the brachial artery below
shoulder - the part of the body between the neck and the upper arm