head of the penis or clitoris, 1640s, from Latin glans "acorn," also used of acorn-shaped things (see gland).
Entries linking to glans
gland n.
1690s, from French glande (Old French glandre "a gland," 13c.), from Latin glandula "gland of the throat, tonsil," diminutive of glans (genitive glandis) "acorn, nut; acorn-shaped ball," from PIE root *gwele- (2) "acorn" (source also of Greek balanos, Armenian kalin, Old Church Slavonic zelodi "acorn;" Lithuanian gilė "acorn"). Earlier English form was glandula (c. 1400); Middle English also had glandele "inflamed gland" (c. 1400). Extended from tonsils to glands generally.