axilla
1. [ noun ] (anatomy,zoology) the hollow under the arm where it is joined to the shoulder
Synonyms: armpit axillary_fossa axillary_cavity
Examples:

"they were up to their armpits in water"

Related terms: cavity shoulder axillary_artery
Similar spelling:   axil
  axially
  axle
  axel
  Axley
  axile
  axial