Lewis & Short

lactārĭus, a, um, adj. [lac], of or belonging to milk, containing milk, milky; made of milk or with milk.

  1. I. In gen.: lactaria columna in foro holitorio dicta, quod ibi infantes lacte alendos deferebant, Paul. ex Fest. p. 88: herba, milk-weed, Plin. 26, 8, 39, § 62: opus, food prepared with milk, Lampr. Heliog. 32: Mons, a hill in Campania, famous for its pasture, Cassiod. Var. 11, 10 init.
    So, absol.: lactārĭum, ii, n., milkfood, Lampr. Heliog. 26.—lactārĭus, ii, m., a preparer of milk-food, Lampr. Heliog 27, 3.
    Also, a seller of milk, = γαλακτοπώλης, Gloss. Labb.
  2. II. In partic., suckling, giving suck: boves, Varr. R. R. 2, 1, 17.