The definition of a heifer is a young female cow that hasn't given birth to a calf.
(noun)A nine month old female cow with no offspring is an example of aheifer.
See heifer in Webster's New World College Dictionary
noun
Origin: ME haifre < OE heahfore, lit., full-grown young ox < heah, high, hence full-grown (see high) + fearr, bull, lit., young animal: see farrow
See heifer in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English
Origin: , from Old English hēahfore; see perə-1 in Indo-European roots
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