English
stem borer
From stem + borer.
Proto-Indo-European *steh₂- ‘to stand, stay’
Proto-Germanic *stamniz ‘stem, tree stalk’
Proto-West Germanic *stamni
Old English stemn
Middle English stem
English stem
Today it means
noun Any insect larva, or arthropod, that bores into plant stems.
Language periods are conventional ranges, not dates for this word.
Etymograph / stem borer