prostaglandin
noun
pros·ta·glan·din
ˌprä-stə-ˈglan-dən
: any of various oxygenated unsaturated cyclic fatty acids of animals that are formed chiefly by the action of cyclooxygenase on arachidonic acid and perform a variety of hormonelike actions (as in controlling blood pressure or smooth muscle contraction)
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Merriam-Webster unabridged
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