The Collaborative International Dictionary of English v.0.48:

Colander \Col"an*der\, n. [L. colans, -antis, p. pr. of colare
   to filter, to strain, fr. colum a strainer. Cf. Cullis,
   Culvert.]
   A utensil with a bottom perforated with little holes for
   straining liquids, mashed vegetable pulp, etc.; a strainer of
   wickerwork, perforated metal, or the like.
   [1913 Webster] Cola nut

WordNet (r) 3.0 (2006):

colander
    n 1: bowl-shaped strainer; used to wash or drain foods [syn:
         colander, cullender]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "colander":
   bolter, clarifier, cradle, cribble, cribriformity, cribrosity,
   filter, grate, grating, honeycomb, lixiviator, net, percolator,
   porosity, porousness, purifier, refiner, refinery, riddle, rocker,
   screen, sieve, sievelikeness, sifter, sorter, sponge, strainer,
   winnow, winnowing basket, winnowing fan, winnowing machine