Source : Webster's Revised Unabridged Dictionary (1913)

Wheatworm \Wheat"worm`\, n.
   A small nematode worm ({Tylenchus tritici}) which attacks
   wheat, advancing through the stem to the grains in the air.

Source : WordNet®

Tylenchus tritici
     n : small roundworm parasitic on wheat [syn: {wheatworm}, {wheat
         eel}, {wheat eelworm}]