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Webster 1913 Edition

Noun.

The act, art, or process of covering or coating anything with melted tin, or with tin foil, as kitchen utensils, locks, and the like.

The covering or lining of tin thus put on.

ppr.

[from tin.] Covering with tin or tinfoil.

Noun.

The act, art or practice of covering or lining any thing with melted tin or with tinfoil, as kitchen utensils, locks, bits, &c.

tinning

tinning ‎(plural tinnings)

A covering or lining of tin.
- 1852, The Edinburgh Medical and Surgical Journal: Volume 77 (page 175)
  […] he admits that sometimes poisonings produced by utensils with worn tinnings are not caused by saturnine colic.

tinning m