northern waterthrushn. a thrush-like, ground-dwelling warbler, Seiurus noveboracensis (family Parulidae), which breeds in woodland bogs and swamps in Canada and the northern U.S.
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1869 Galaxy Aug. 175 The other specimen was the Northern or small water-thrush, S. novoboresences [sic].
1989 Independent 1 Sept. 6 Bird watchers are flocking to the Isles of Scilly to see a Northern Waterthrush, a rare warbler from North America.