The Collaborative International Dictionary of English v.0.48:

Tin \Tin\, v. t. [imp. & p. p. Tinned; p. pr. & vb. n.
   Tinning.]
   To cover with tin or tinned iron, or to overlay with tin
   foil.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tinned \Tinned\, a.
   1. Covered, or plated, with tin; as, a tinned roof; tinned
      iron.
      [1913 Webster]

   2. Packed in tin cases; canned; as, tinned meats. --Cassell
      (Dict. of Cookery).
      [1913 Webster]

WordNet (r) 3.0 (2006):

tinned
    adj 1: sealed in a can or jar [syn: canned, tinned]