Definition of axilla in English:
 axilla
nounPlural axillae akˈsɪləækˈsɪlə
1Anatomy 
An armpit, or the corresponding part in a bird or other animal.
 Example sentencesExamples
-  A holosystolic murmur that may radiate to the axilla, the upper sternal borders or the subscapular region is apparent on physical examination.
 -  The nurse preps the patient's breast, chest, axilla, and upper arm with the surgeon's solution of choice and drapes the patient to expose these areas.
 -  The T2 nerve root controls the palms on either side and the T4 nerve root controls the axilla and armpit.
 -  Although outbreaks can occur almost anywhere, the axillae, web spaces between fingers, and flexor surfaces of the wrists are the most common areas.
 -  Extremities showed tenderness over the right shoulder and axilla.
 
2Botany 
An axil.
 Example sentencesExamples
-  In coconut palms, egg-laying occurs at the axillas of the leaves.
 -  Basal branches emerged from lower axillas and developed earlier.
 
Origin
  
Early 17th century: from Latin, diminutive of ala 'wing'.