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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A mender of brass kettles, pans, and other metal ware. Tailors and tinkers.

2. One skilled in a variety of small mechanical work.

3. A small mortar on the end of a staff.

4. (Science: zoology) A young mackerel about two years old. The chub mackerel.

The silversides.

A skate.

5. (Science: zoology) The razor-billed auk.

Origin: From Tink, because the tinker's way of proclaiming his trade is to beat a kettle, or because in his work he makes a tinkling noise. Johnson.