Webster’s Revised Unabridged Dictionary · 1913
Kelpie
Kel′pie, 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.