Definition of invalids:
(adj) :
Not valid; not true, correct, acceptable or appropriate.
(adj) :
Suffering from disability or illness.
(n) :
(dated, sometimes offensive) Any person with a disability or illness.
(n) :
(dated, sometimes offensive) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
(adj) :
Intended for use by an invalid.
(v) :
(British, transitive) To exempt from (often military) duty because of injury or ill health.