In plants, an upper angle or point of separation between the upper side of a branch, leaf, flower, or stalk of a leaf, and the stem or branch from which it grows: The axils of seed plants usually contain one or more axillary, or lateral, buds, from which a leaf shoot or a flower, thorn, or tendril may develop.

An axil is known as the angle that is formed by a leaf or branch with the stem.