rootworm

[root-wurm, root-]

root·worm

[root-wurm, root-]
noun
1.
the larva of any of several insects, as the cucumber beetle, that feeds on the roots of plants.
2.
any of several nematodes, especially of the genus Heterodera, that puncture and feed in the roots of plants.

Origin:
1795–1805; root1 + worm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Rootworm is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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