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Longman Dictionary of Contemporary English
invalid
I.adjective
COLLOCATIONS FROM OTHER ENTRIES
declare sth illegal/invalid etc
▪ The war was declared illegal by the International Court of Justice.
EXAMPLES FROM OTHER ENTRIES
▪ Ackerman said the argument was invalid.
▪ Do not detach the coupon or your ticket will be invalid.
▪ I'm afraid your ticket is invalid on this route.
▪ This passport is invalid. Look at the expiry date.
EXAMPLES FROM CORPUS
▪ As it turns out, the fears that govern such organizations derive in large part from invalid or negative core beliefs.
▪ But the vote has been declared invalid because fewer than half the parents took part in the ballot.
▪ For this reason, you can readily identify them as valid or invalid.
▪ In one attack his invalid car was stolen and smashed.
▪ Mrs H described the knock at the door that woke her and her invalid husband at seven o'clock.
▪ The survey attempted to answer critics who have dismissed international comparisons as invalid because of differences in cultural expectations about health care.
▪ When I was a child, there was a man who came to our chapel in an invalid chair.
▪ When the council sought to evict him for non-payment of the extra rent he pleaded in defence that the resolution was invalid.
II.noun
EXAMPLES FROM OTHER ENTRIES
▪ Barbara decided to move her invalid mother to Mississippi, so that she could look after her herself.
▪ My father's an invalid, and needs constant care.
EXAMPLES FROM CORPUS
▪ Crippled by an inmate, he faces the rest of his life as an invalid.
▪ His elder brother Edwin was next in succession to the baronetcy, but he was a total invalid.
▪ I pictured nocturnal gamblers crouching over their cards, sleepless lovers writing letters, nurses sitting by the beds of invalids.
The Collaborative International Dictionary
Invalid

Invalid \In"va*lid\ (?; 277), n. [F. invalide, n. & a., L. invalidus, a. See Invalid null.] A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself.

Invalid

Invalid \In"va*lid\, a. [See Invalid, n.] Not well; feeble; infirm; sickly; as, he had an invalid daughter.

Invalid

Invalid \In"va*lid\, v. t.

  1. To make or render invalid or infirm. ``Invalided, bent, and almost blind.''
    --Dickens.

  2. To classify or enroll as an invalid.

    Peace coming, he was invalided on half pay.
    --Carlyle.

Invalid

Invalid \In*val"id\, a. [Pref. in- not + valid: cf. F. invalide, L. invalidus infirm, weak. Cf. Invalid infirm.]

  1. Of no force, weight, or cogency; not valid; weak.

  2. (Law) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.

Douglas Harper's Etymology Dictionary
invalid

"not strong, infirm," 1640s, from Latin invalidus "not strong, infirm, weak, feeble," from in- "not" (see in- (1)) + validus "strong" (see valid). Specific meaning "infirm from sickness, disease, or injury" is from 1640s.

invalid

"of no legal force," 1630s, from special use of Latin invalidus (see invalid (adj.1)).\n

invalid

1709, originally of disabled military men, from invalid (adj.1). Invalides is short for French Hôtel des Invalides, home for old and disabled soldiers in the 7th arrondissement of Paris.

Wiktionary
invalid

Etymology 1

  1. Not valid; not true, correct, acceptable or appropriate. Etymology 2

    a. Intended for use by an invalid. n. 1 (cx dated sometimes offensive English) Any person with a disability or illness. 2 (cx dated sometimes offensive English) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves. 3 (cx archaic English) A disabled member of the armed forces; one unfit for active duty due to injury. v

  2. (context British English) To exempt from duty because of injury or ill health.

WordNet
invalid
  1. adj. having no cogency or legal force; "invalid reasoning"; "an invalid driver's license" [ant: valid]

  2. no longer valid; "the license is invalid"

invalid

n. someone who is incapacitated by a chronic illness or injury [syn: shut-in]

invalid
  1. v. force to retire, remove from active duty, as of firemen

  2. injure permanently; "He was disabled in a car accident" [syn: disable, incapacitate, handicap]

Wikipedia
Invalid

Invalid may refer to:

  • Patient, a sick person
  • one who is confined to home or bed because of illness, disability or injury (seen by some as a politically incorrect term)
  • .invalid, a top-level Internet domain not intended for real use

As the opposite of valid:

  • Validity, in logic, true premises cannot lead to a false conclusion
  • Validity (statistics), a measure which is measuring what it is supposed to measure

Usage examples of "invalid".

You simply wish to keep Abigail an invalid so you can visit her in her bed.

But for domestic use we cannot advise its employment, as it is liable to injure the invalid, when its action is carried too far, which is apt to be the case, when not administered under the supervision of a competent physician.

While properly regulating and restricting the food of the invalid when necessary, they also recognize the fact that many are benefited by a liberal diet of the most substantial food, as steaks, eggs, oysters, milk, and other very nutritious articles of diet, which are always provided in abundance for those for whom they are suited.

The woman then came, and I thanked her for the care she had taken of the invalid.

If clairvoyance does not exist, then clearly the warrant was invalid, and we must reverse New York.

If any man could risk bluffing the police, it was Long Steve, for he still could pass himself as Cruke, a helpless invalid.

If the police looked for Cruke, they would find him in the hospital, under charge of a physician who would swear that the supposed invalid had been there long before the trouble at the Southlake Hotel.

Doc Ruttler, taking orders from the pretended invalid Cruke, could barricade the hospital, then summon the police.

After this I did not leave the bed of the invalid for a single instant.

I tried to buy a diploma for an invalid friend at home who had never traveled, and whose desire all his life has been to ascend Mont Blanc, but the Guide-in-Chief rather insolently refused to sell me one.

The invalid scrutinises what has been waiting for him and him alone beneath the dirndl skirt all these years.

Only a handful refused to do so, claiming that the election was held under duress and therefore invalid.

Similarly, a prohibition of unfair discrimination by any one engaged in the manufacture or distribution of a commodity in general use for the purpose of intentionally destroying competition of any regular dealer in such commodity by making sales thereof at a lower rate in one section of the State than in another, after equalization for distance, effects no invalid deprivation of property or interference with freedom of contract.

Tanto was seated now in the contraption that Favio and Fabel had commissioned for his use: a long, wickerwork chair with two small wheels attached in which the invalid would be able to propel himself along the flatter pathways surrounding the villa.

But at the moment Laura was not really aware of anything except Agnes Fane, who sat watching her approach from an invalid chair.