Webster's English Dictionary

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invalid

1. in.val.id \(')in-'val-*d\ \.in-v*-'lid-*t-e-\ \(')in-'val-*d-le-\ aj [L 
   invalidus weak, fr. in- + validus strong - more at VA]LID : being without 
   foundation or force in fact, truth, or law  - in.va.lid.i.ty n
2. in.va.lid \'in-v*-l*d, Brit usu -.le-d\ aj [L & F; F invalide, fr. L 
   invalidus] 1: suffering from disease or disability : SICKLY  2: of, 
   relating to, or suited to one that is sick 
3. invalid \like 2\ n : one that is sickly or disabled 
4. in.va.lid \'in-v*-l*d, -.lid, Brit usu .in-v*-'le-d\ vt 1: to make 
   sickly or disabled  2: to remove from active duty by reason of sickness or 
   disability