Invalid Definition

ĭnvə-lĭd
invalids
noun
invalids
A weak, sickly person; esp., one who is chronically ill or disabled.
Webster's New World
adjective
Incapacitated by illness or injury.
American Heritage Medicine
Not well; weak and sickly; infirm.
Webster's New World
Of or for invalids.
An invalid home.
Webster's New World
Not valid; having no force; null or void.
Webster's New World
Falsely based or reasoned; faulty.
An invalid argument.
American Heritage
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verb
invalids
To make invalid; disable or weaken.
Webster's New World
To incapacitate physically.
American Heritage
To remove (a soldier, sailor, etc.) from active duty or from a combat zone because of injury or illness.
Webster's New World
To release or exempt from duty because of ill health.
American Heritage
To incapacitate physically.
American Heritage Medicine
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Other Word Forms of Invalid

Noun

Singular:
invalid
Plural:
invalids

Origin of Invalid

  • Latin invalidus weak in- not in–1 validus strong (from valēre to be strong wal- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”)

    From Wiktionary

  • From invalid (influenced by French invalide sickly, infirm)

    From American Heritage Dictionary of the English Language, 5th Edition

  • in- +‎ valid

    From Wiktionary

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