in|val|id

in|va|lid¹ «IHN vuh lihd», noun, adjective, verb.

–n.

1. a sick or weak person not able to get about and do things: »

I have invented an invaluable permanent invalid called Bunbury (Oscar Wilde).

2. a soldier or sailor retired from active service because of sickness or injury.

–adj.

1. not well; weak and sick.

2. for the use of invalids: »

an invalid chair, an invalid car.

–v.t.

1. to make sick or weak; disable.

2. to remove from active service because of sickness or injury: »

The wounded soldier was invalided and sent home.

–v.i.

1. to become an invalid.

2. to retire from active service because of sickness or injury.

╂[< Latin invalidus not strong; influenced by Middle French invalide, learned borrowing from Latin invalidus; see etym. under invalid² (Cf. ↑invalid)]

in|val|id² «ihn VAL ihd», adjective.

not valid; without force or effect; without value; worthless: »

Unless a check is signed, it is invalid.

SYNONYM(S): null, void.

╂[< Latin invalidus < in- not + validus strong < valēre be strong]

–in|val´id|ly, adverb.

–in|val´id|ness, noun.