Invalid
Invalid , adjective
[Prefix in- not + valid: compare French invalide, Latin invalidus infirm, weak. Compare 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.
Invalid (?; 277) , noun
[French invalide, n. & a., Latin 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 , adjective
[See Invalid, n.]
Not well; feeble; infirm; sickly; as, he had an invalid daughter.
Invalid , transitive verb
1.
To make or render invalid or infirm.
Invalided, bent, and almost blind.
2.
To classify or enroll as an invalid.
Peace coming, he was invalided on half pay.