Lewis & Short

sūmen, inis, n. [contr. from sugimen, sugmen, from sugo], a breast, of women (syn.: uber, mamma).

  1. I. Lit.
    1. A. In gen.: manus lactanti in sumine sidat, Lucil. ap. Non. 458, 7.
    2. B. In partic., a sow’s udder, the paps of a sow (esteemed a delicacy by the Romans): pernam, abdomen, sumen, suis glandium, Plaut. Curc. 2, 3, 44; id. Ps. 1, 2, 33; id. Capt. 4, 3, 4; Plin. 11, 37, 84, § 211; Mart. 13, 44, 1.
      1. * 2. Meton., a sow, a hog, Juv. 12, 73.
  2. II. Transf., the fat part, the richest portion: (Caesar Vopiscus) campos Roseae Italiae dixit esse sumen, Varr R. R. 1, 7, 10; Plin. 17, 4, 3, § 32.