Usually means: Barrier preventing vehicles from straying.
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We found 22 dictionaries that define the word guardrail:

General (17 matching dictionaries)
  1. guardrail: Merriam-Webster
  2. guardrail: Oxford Learner's Dictionaries
  3. guardrail: American Heritage Dictionary of the English Language
  4. guardrail: Collins English Dictionary
  5. guardrail: Vocabulary.com
  6. Guardrail, guardrail: Wordnik
  7. guardrail: Wiktionary
  8. guardrail: Webster's New World College Dictionary, 4th Ed.
  9. guardrail: The Wordsmyth English Dictionary-Thesaurus
  10. guardrail: Infoplease Dictionary
  11. guardrail: Dictionary.com
  12. Guardrail (disambiguation), Guardrail (road), Guardrail: Wikipedia, the Free Encyclopedia
  13. guardrail: Rhymezone
  14. guardrail: FreeDictionary.org
  15. guardrail: Mnemonic Dictionary
  16. guardrail: TheFreeDictionary.com
  17. guardrail: Longman Dictionary of Contemporary English

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)
  1. guardrail: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. GUARDRAIL: Acronym Finder

Slang (1 matching dictionary)
  1. guardrail: Urban Dictionary

Tech (1 matching dictionary)
  1. Guardrail: Latitude Mexico

(Note: See guardrailing as well.)

Definitions from Wiktionary (guardrail)

noun:  A rail set alongside a dangerous place as a barrier, to improve safety.
noun:  (Canada, US) A strengthened barrier installed on the sides of a (usually major) road to keep vehicles on the highway and reduce the risk and/or impact of crashes.
noun:  (figurative, by extension) Any barrier designed to prevent accidents or mistakes.
noun:  (rail transport) Synonym of check rail.

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