Webster’s Revised Unabridged Dictionary · 1913
Jointworm
Joint′worm′ (·wûrm′), n. (Zoöl.) The larva of a small, hymenopterous fly (Eurytoma hordei), which is found in gall-like swellings on the stalks of wheat, usually at or just above the first joint. In some parts of America it does great damage to the crop.