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prostaglandin (n.)

substance found in seminal fluid, 1936, from German (1935); see prostate + gland + chemical suffix -in (2).

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Definitions of prostaglandin from WordNet

prostaglandin (n.)
a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity;
From wordnet.princeton.edu