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[in-vuh-lid; British in-vuh-leed]
an infirm or sickly person.
a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life.
Archaic. a member of the armed forces disabled for active service.
unable to care for oneself due to infirmity or disability: his invalid sister.
of or for invalids: invalid diets.
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Invalid | Definition of invalid by Merriam-Webster

a : being without foundation or force in fact, truth, or law <an invalid assumption> <declared the will invalid>. b : logically inconsequent. — in·val·id·ly \-lē\ adverb.

Invalid Medical Definition | Merriam-Webster Medical Dictionary

adj in·va·lid \ˈin-və-ləd, British usually -ˌlēd\. Medical Definition of INVALID. 1. : suffering from disease or disability : sickly. 2. : of, relating to, or suited to one that  ...

Invalid - definition of invalid by The Free Dictionary

One who is incapacitated by a chronic illness or disability. adj. 1. Incapacitated by illness or injury. 2. Of, relating to, or intended for invalids. tr.v. in·va·lid·ed, ...

invalid - Dictionary Definition :

A driver's license that has expired is invalid — it needs to be renewed. If you lost your health insurance, it's invalid. People who are called invalids are disabled ...

invalid - definition of invalid in English from the Oxford dictionary

There are 2 main definitions of invalid in English: 1; 2. Share this entry. email cite discuss. invalid 1. See definition in Oxford Advanced Learner's Dictionary.

Urban Dictionary: Invalid

Top Definition. Invalid. Inconsistent with some web programmer's arbitrary and frequently incorrect notion of how the world should be. A: Why does that web site  ...

Definition of “invalid” | Collins English Dictionary

Definition of “invalid” | The official Collins English Dictionary online. Comprehensive and authoritative, rely on Collins for up-to-date English with insights into ...

Invalid dictionary definition | invalid defined - YourDictionary

invalid. Play [in′və lid; chiefly Brit, -lēd′]. Use invalid in a sentence. LINK / CITE ADD TO WORD LIST. An elderly invalid. Licensed from iStockPhoto. adjective.

invalid Definition in the Cambridge English Dictionary

invalid definition, meaning, what is invalid: An invalid document, ticket, law, etc. is not legally or officially acceptable: . Learn more.

invalid | Define invalid at
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Popular Q&A
Q: What is the definition of invalid?
A: Invalid means having no cogency or legal force; "invalid reasoning" "an invalid Read More »
Q: What is the definition of an invalid disjunctive syllogism?
A: ...a disjunctive proposition--p and q--are called disjunct... Read More »
Q: What's the definition of invalidate?
A: invalidate: declare invalid; make invalid for use; show to be invalid; take away the legal force of or render ineffective Read More »
Q: What's the definition of invalidism?
A: invalidism: chronic ill health Read More »
Q: What is medical definition of invalidism?
A: in'vă-lid-izm The condition of being an invalid. Read More »