railroad-worm

railroad worm

noun
the larva of a fruit fly, Rhagoletis pomonella, that burrows through apples, forming tunnels that sometimes appear on the skin as faint depressions or darkened trails: a serious pest of apples in colder regions of North America.
Also called apple maggot.


Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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