Lewis & Short

2. tŭber, ĕris, m. and f.

  1. I. Fem., a kind of apple-tree, Plin. 16, 25, 42, § 103; Col. 11, 2, 11; Pall. Jan. 15, 20; id. Sept. 14, 1.
  2. II. Masc., the fruit of this tree, Plin. 15, 14, 14, § 47; Mart. 13, 42, 1; 13, 43, 2; Suet. Dom. 16.