hair of pectoral girdle hair of axilla http://purl.obolibrary.org/obo/UBERON_0013699 http://purl.org/sig/ont/fma/fma54253 https://en.wikipedia.org/wiki/Underarm_hair https://www.wikidata.org/wiki/Q340687 A strand of hair that is part of the axilla. This is not the same as axillary hair found on monocots and mosses. armpit hair axilla hair axillary hair strand of axillary hair underarm hair set of axillary hairs The Complete Dictionary of Sexology