invalid

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in·va·lid

(in'vă-lid),
1. Weak; sick.
2. A person partially or completely disabled.
[L. in- neg. + validus, strong]
Farlex Partner Medical Dictionary © Farlex 2012

invalid

(ĭn′və-lĭd)
n.
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. inva·lided, inva·liding, inva·lids
1. To incapacitate physically.
2. Chiefly British To release or exempt from duty because of ill health: "I was not quite sick enough to be invalided out, even though I was of no more use" (Mary Lee Settle).
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

in·va·lid

(in'vă-lid)
1. Weak; sick.
2. A person partially or completely disabled.
[L. in- neg. + validus, strong]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

invalid

(ĭn′vă-lĭd) [L. in-, not, + validus, strong]
1. A former term for a person who is not well; weak. Use of the term is archaic.
2. Based on false premises, reasonings, or justifications.
Medical Dictionary, © 2009 Farlex and Partners