Lewis & Short

1. bulbus (bulbŏs), i, m. [βολβός].

  1. I. A bulb, bulbous root (tulips, hyacinths, lilies, etc.), Plin. 19, 4, 21, § 61; cf. Cels. 2, 18; Plin. 17, 20, 33, § 144; 21, 5, 11, § 24; 22, 22, 32, § 67 sq.
  2. II. An onion; a garden vegetable of several kinds, among which the Megarean was the best known, Cato, R. R. 8, 2; Ov. R. Am. 797; Col. 10, 106; 4, 32, 2; Plin. 19, 5, 30, § 93; in Apic. 8, 7, and in Edict. Diocl. p. 16, called bulbus fabrilis.