The Collaborative International Dictionary of English v.0.48:

Weevil \Wee"vil\, n. [OE. wivel, wevil, AS. wifel, wibil; akin
   to OD. wevel, OHG. wibil, wibel, G. wiebel, wibel, and
   probably to Lith. vabalas beetle, and E. weave. See Weave.]
   (Zool.)
   Any one of numerous species of snout beetles, or
   Rhynchophora, in which the head is elongated and usually
   curved downward. Many of the species are very injurious to
   cultivated plants. The larvae of some of the species live in
   nuts, fruit, and grain by eating out the interior, as the
   plum weevil, or curculio, the nut weevils, and the grain
   weevil (see under Plum, Nut, and Grain). The larvae of
   other species bore under the bark and into the pith of trees
   and various other plants, as the pine weevils (see under
   Pine). See also Pea weevil, Rice weevil, Seed weevil,
   under Pea, Rice, and Seed.
   [1913 Webster]

WordNet (r) 3.0 (2006):

weevil
    n 1: any of several families of mostly small beetles that feed
         on plants and plant products; especially snout beetles and
         seed beetles