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A heifer is a young female cow that has not yet given birth to a calf. Farmers need a separate word because a female cow's life changes after that first birth: until then she is a heifer; after that, people just call her a cow. It is an ordinary farm word, not fancy, but city students may never hear it. You will meet it in farming, in exams about animals, and in stories set on the land. Though actually, in some places people also use heifer as a rude name for a woman. That use is , and you should not copy it. On the farm, the word is calm and exact; about a person, it can sting.
小母牛（還沒生過牛犢的）
組成從中古英語 heyfre、heyfer 傳下來，再往上是古英語 hēahfore、hēahfru。這古詞從哪裡來，學者說法不一，所以起源故事就停在這裡。
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
heifernoun/ˈhɛfə(ɹ)/
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A young female cow, (particularly) one over one year old but which has not calved.
- And the Lord ſpake vnto Moſes and vnto Aaron, ſaying, This is the ordinance of the Law, which the Lord hath commaunded, ſaying, Speak vnto the childꝛen of Iſrael, that they bꝛing thee a red heifer without ſpot, wherein is no blemiſh, and vpon which neuer came yoke.
- We muſt be neat; not neat, but cleanly, Captaine: / And yet the Steere, the Heycfer^([sic]), and the Calfe, / Are all call'd Neat.
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obsoleteA wife.
- Her, whom I shall choose for my heicfar.
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derogatoryslangAn unattractive or unpleasant woman.
- I have half a mind to marry that heifer, tho' wives are bothersome critters when you have too many of them.
- Stop your crying, heifer, I don't need all that, I got a job for you, the braided-up pimp is back!
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。