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From The Collaborative International Dictionary of English v.0.48:
Kelpie \Kel"pie\, Kelpy \Kel"py\, n.; pl. Kelpies. [Cf. Gael. cailpeach, calpach, colpach, a heifer, steer, colt, colpa a cow or horse.] (Scotch Myth.) An imaginary spirit of the waters, horselike in form, vulgarly believed to warn, by preternatural noises and lights, those who are to be drowned. --Jamieson. [1913 Webster]