armpit armpiece • armplate · · · Info · Definitions · Synonyms · Characters · · armpit · · Text Latin · · Script 6 · · Length Definitions · · · (noun) the hollow under the arm where it is joined to the shoulder. Synonyms: axilla, axillary cavity, axillary fossa. Example: "They were up to their armpits in water." · · Noun Definition 1 Synonyms · · · axilla · · 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 m latin small letter m U+006D p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074