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Webster 1913 Edition

Adj.

Containing, or partaking of the nature of, copper; like copper;

as, a

copperish

taste

Adj.

Containing copper; like copper or partaking of it.

copperish ‎(comparative more copperish, superlative most copperish)

Like copper; coppery.
- 1938, Xavier Herbert, Capricornia, Chapter V, pp. 63,
  She was naked like himself, but chocolate-coloured, not copperish as he was.