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]