Invalid

in-val′id, adj. without value, weight, or cogency: having no effect: void: null.— adj. In′valid , deficient in health, sick, weak.— n. one who is weak: a sickly person: one disabled for active service, esp. a soldier or sailor.— v.t. to make invalid or affect with disease: to enrol on the list of invalids.— v.t. Inval′idāte , to render invalid: to weaken or destroy the force of.— ns. Invalidā′tion ; In′valid hood , In′validism ; In′valid ing , the return home, or to a more healthy climate, of soldiers or sailors who have been rendered incapable of active duty by wounds or the severity of foreign service; Invalid′ity , Inval′idne , want of cogency: want of force.