axilla axile placentation • axillae · · · Info · Definitions · Synonyms · Characters · · axilla · · Text Latin · · Script 6 · · Length 3 · · Syllables Definitions · · · (noun) the hollow under the arm where it is joined to the shoulder. Synonyms: armpit, axillary cavity, axillary fossa. Example: "They were up to their armpits in water." · · Noun Definition 1 Synonyms · · · armpit · · Synonym 1 axillary cavity · · Synonym 2 axillary fossa · · Synonym 3 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C x latin small letter x U+0078