axilla
UK[akˈsɪlə]US[ækˈsɪlə]
n
the technical term for the armpit.
n
the area on the underside of a bird's wing corresponding to the armpit.
n
the axil of a leaf or branch.
Etymology
the word 'axilla' was borrowed directly from latin, where it meant 'armpit' or 'little wing'. in latin, it is a diminutive form of 'ala', meaning 'wing', which itself traces back to the proto-indo-european root aks-, meaning 'axis' or 'shoulder joint'. this etymological journey connects the concept of a joint or angle to the anatomical hollow beneath the shoulder. the term entered english in the early 17th century, primarily for scientific and medical precision, retaining its original latin form and anatomical specificity.
Analysis
this word is a direct latin loanword and is not productively segmented into smaller morphemes in modern english.
Examples
the surgeon made an incision in the left axilla to access the lymph nodes.
the vaccine is typically administered in the deltoid muscle or the axilla.
in botany, a bud located in the axilla of a leaf is called an axillary bud.