n. & v.
—n.
1 a person enfeebled or disabled by illness or injury.
2 (attrib.) a of or for invalids (invalid car; invalid diet). b being an invalid (caring for her invalid mother).
—v. (invalided, invaliding)
1 tr. (often foll. by out etc.) remove from active service (one who has become an invalid).
2 tr. (usu. in passive) disable (a person) by illness.
3 intr. become an invalid.
Derivatives:
invalidism n.
Etymology: L invalidus weak, infirm (as IN-(1), VALID)
2.
adj. not valid, esp. having no legal force.
Derivatives:
invalidly adv.
Etymology: L invalidus (as INVALID(1))
Useful english dictionary. 2012.