The more important consideration is an individual child’s physical development: If he’s skeletally immature, if he hasn’t developed axillary hair, he shouldn’t play tackle football.

Small marsh annuals, with opposite leaves, membranous stipules, minute axillary flowers, few stamens, and pod 2–5-celled.

Of or pertaining to the axilla or armpit; as, axillary gland, artery, nerve.