Etymology
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colostrum (n.)

"the first milk secreted in the breasts after childbirth," 1570s, from Latin colostrum "first milk from an animal," earlier colustra, a word of unknown etymology.

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Definitions of colostrum

colostrum (n.)
milky fluid secreted for the first day or two after parturition;
Synonyms: foremilk
From wordnet.princeton.edu