Definitions of invalid:
  • noun:   someone who is incapacitated by a chronic illness or injury
  • verb:   force to retire, remove from active duty, as of firemen
  • verb:   injure permanently
  • adjective:   having no cogency or legal force
    Example: "Invalid reasoning"
  • adjective:   no longer valid
    Example: "The license is invalid"

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Search for invalid at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

Book See invalid used in context: 11 rhymes, several books and articles.

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