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jointworm

[joint-wurm]
noun
  1. the larva of any of several chalcid flies of the family Eurytomidae, especially of the genus Harmolita, that feeds within the stems of grasses, often causing a gall near the first joint.
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Origin of jointworm

First recorded in 1700–10; joint + worm
Also called strawworm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for jointworm

jointworm

noun
  1. US the larva of chalcid flies of the genus Harmolita, esp H. tritici, which form galls on the stems of cereal plants
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012