add. ·noun a small nematode worm (tylenchus tritici) which attacks wheat, advancing through the stem to the grains in the air.
2. wheatworm ·noun a small nematode worm (anguillula tritici) which attacks the grains of wheat in the ear. it is found in wheat affected with smut, each of the diseased grains containing a large number of the minute young of the worm.