The Collaborative International Dictionary of English v.0.48:

Pyralid \Pyr"a*lid\, n. [L. pyralis, -idis, a kind of winged
   insect.] (Zool.)
   Any moth of the family Pyralid[ae]. The species are
   numerous and mostly small, but some of them are very
   injurious, as the bee moth, meal moth, hop moth, and clover
   moth.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pyralid
    n 1: usually tropical slender-bodied long-legged moth whose
         larvae are crop pests [syn: pyralid, pyralid moth]