I.a breast, pap, nipple, teat.
I. Lit., Vell. 2, 70, 5; Juv. 6, 400: “laeva in parte mamillae Nil salit juveni,” id. 7, 159: “scrofa triginta clara mamillis,” id. 12, 74; 13, 163.—As a term of endearment, Plaut. Ps. 1, 2, 47.—
II. Transf., a little pipe joined to a larger one, Varr. R. R. 3, 14, 2.