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The Collaborative International Dictionary
tarrock

Taring \Tar"ing\, n. (Zo["o]l.) The common tern; -- called also tarret, and tarrock.

Wiktionary
tarrock

n. 1 (context Northern Scotland English) a young kittiwake. 2 (context UK dialect English) The (vern: common guillemot). 3 (context UK dialect English) The common tern.