axilla

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axilla

[ak′sil·ə]
(anatomy)
The depression between the arm and the thoracic wall; the armpit.
(botany)
An axil.
References in periodicals archive ?
Rome, you see, would be the ideal place to shoot an advert for underam products - and I'm willing to go as creative adviser.
Unlike in the London Tube, where underams are covered up because of our climate, in baking Rome, T-shirts and vests are the order of the day.