Source : Webster's Revised Unabridged Dictionary (1913)

Heifer \Heif"er\, n. [OE. hayfare, AS. he['a]hfore, he['a]fore;
   the second part of this word seems akin to AS. fearr bull,
   ox; akin to OHG. farro, G. farre, D. vaars, heifer, G.
   f["a]rse, and perh. to Gr. ?, ?, calf, heifer.] (Zo["o]l.)
   A young cow.

Source : WordNet®

heifer
     n : young cow