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prolactin (n.)

"hormone which promotes lactation," 1932, from pro- + stem of lactation + chemical suffix -in (2).

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Definitions of prolactin from WordNet

prolactin (n.)
gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition;
Synonyms: lactogenic hormone / luteotropin
From wordnet.princeton.edu