in-valid

invalid

1 [in-vuh-lid; British in-vuh-leed]
noun
1.
an infirm or sickly person.
2.
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.
3.
Archaic. a member of the armed forces disabled for active service.
adjective
4.
unable to care for oneself due to infirmity or disability: his invalid sister.
5.
of or for invalids: invalid diets.
6.
(of things) in poor or weakened condition: the invalid state of his rocking chair.
verb (used with object)
7.
to affect with disease; make an invalid: He was invalided for life.
8.
to remove from or classify as not able to perform active service, as an invalid.
9.
British. to remove or evacuate (military personnel) from an active theater of operations because of injury or illness.
verb (used without object) Archaic.
10.
to become an invalid.

Origin:
1635–45; < French invalide < Latin invalidus weak. See in-3, valid

Dictionary.com Unabridged

invalid

2 [in-val-id]
adjective
1.
not valid; without force or foundation; indefensible.
2.
deficient in substance or cogency; weak.
3.
void or without legal force, as a contract.

Origin:
1625–35; < Medieval Latin invalidus, Latin: weak; see invalid1

invalidly, adverb
invalidness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
invalid1 (ˈɪnvəˌliːd, -lɪd)
 
n
1.  a.  a person suffering from disablement or chronic ill health
 b.  (as modifier): an invalid chair
 
adj
2.  suffering from or disabled by injury, sickness, etc
 
vb
3.  to cause to become an invalid; disable
4.  chiefly (Brit) (usually foll by out; often passive) to require (a member of the armed forces) to retire from active service through wounds or illness
 
[C17: from Latin invalidus infirm, from in-1 + validus strong]
 
usage  It is best to avoid using the term invalid when referring to people with chronic illnesses or disabilities
 
inva'lidity1
 
n

invalid2 (ɪnˈvælɪd)
 
adj
1.  not valid; having no cogency or legal force
2.  logic (of an argument) having a conclusion that does not follow from the premises: it may be false when the premises are all true; not valid
 
[C16: from Medieval Latin invalidus without legal force; see invalid1]
 
invalidity2
 
n
 
in'validness2
 
n
 
in'validly2
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

invalid
1635, "not strong, infirm," also "of no legal force," from L. invalidus "not strong, infirm, weak, feeble," from in- "not" + validus "strong." Meaning "infirm from sickness, disease, or injury" is from 1642. The noun is first recorded 1704, originally of disabled military men. Invalidate is from 1649.
Invalides is short for Fr. Hôtel des Invalides, home for old and disabled soldiers in Paris.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

invalid in·va·lid1 (ĭn'və-lĭd)
n.
One who is incapacitated by a chronic illness or disability. adj.
Incapacitated by illness or injury.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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