Usually means: Bioluminescent larva, not actual worm.
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We found 12 dictionaries that define the word railroad worm:

General (11 matching dictionaries)
  1. railroad worm: Merriam-Webster
  2. railroad worm: Vocabulary.com
  3. railroad-worm: Wordnik
  4. railroad worm: Wiktionary
  5. railroad worm: Infoplease Dictionary
  6. railroad worm: Dictionary.com
  7. Railroad worm: Wikipedia, the Free Encyclopedia
  8. railroad worm: Rhymezone
  9. railroad worm: FreeDictionary.org
  10. railroad worm: Mnemonic Dictionary
  11. railroad worm: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Railroad-worm, railroad worm: Encyclopedia

Definitions from Wiktionary (railroad worm)

noun:  A larva or larviform female adult of a beetle of the genus Phrixothrix, characterized by two different colours of bioluminescence, red and green, like railroad signals.
noun:  An apple maggot (Rhagoletis pomonella)

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