Lewis & Short

1. cŏlŭmella (in MSS. often cŏlum-nella), ae, f. dim. [columna, columen],

  1. I. a small column, a pillar, Cato, R. R. 20, 1; 22, 2; Cic. Leg. 2, 26, 66; id. Tusc. 5, 23, 65; Caes. B. C. 2, 10.
    1. B. The foot or pedestal of a catapult, Vitr. 10, 15.
  2. II. Trop., a pillar, support, prop (cf. columen), Lucil. ap. Don. Ter. Phorm. 2, 1, 57.