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Webster's Dictionary (1865)

Trōp'ie-bird, n.

noun

n. (Ornith.) A bird of the genus Phæton, found at sea in the torrid zone, having very long wings and two long, slender tail-feathers.

An illustration of a tropic bird perched on a branch, with long tail feathers trailing downward.
Tropic Bird (Phaeton phoenicurus).