Definition

A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.

Other Definitions

This word also has 2 other definitions:

INVALID (adjective)

1. Of no force, weight, or cogency; not valid; weak. 2. Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.

INVALID (verb)

1. To make or render invalid or infirm. "Invalided, bent, and almost blind." Dickens. 2. To classify or enroll as an invalid. Peace coming, he was in...