Entry 1 sense Webster, 1913 Supra-axillary · Su·pra-ax·il·la·ry · IPA 01 a. Growing above the axil; inserted above the axil, as a peduncle. See Suprafoliaceous. 1. Growing above the axil; inserted above the axil, as a peduncle. See Suprafoliaceous.(Bot.) See: Suprafoliaceous