Lewis & Short

caulĭcŭlus or cōlĭcŭlus, i, m. dim. [caulis],

  1. I. the small stalk or stem of a plant; form cauliculus, Cels. 2, 18; Plin. 23, 7, 63, § 119; Suet. Gram. 11; Scrib. Comp. 128; Veg. 2, 6, 2; form coliculus, Cato, R. R. 158, 1; Varr. R. R. 1, 31, 4; 1, 42, 4; Col. 11, 2, 10; 12, 7, 1; 12, 56, 1.
  2. II. In architecture, a stalk or stem as an ornament on the capitals of columns, Vitr. 4, 1, 12; 7, 5, 3.