axillary Syllabification: (ax·il·lar·y)Pronunciation: /ˈaksəˌlerē/Definition of axillary adjective Anatomy of or relating to the armpit:enlargement of the axillary lymph nodes Botany in or growing from an axil:axillary shootsOften contrasted with terminal.axillary in other Oxford dictionaries Definition of axillary in the British & World English dictionary