Dictionary  rail'road worm"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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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