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methysergide

[meth-uh-sur-jahyd]
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noun Pharmacology.
  1. an ergot alkaloid derivative, C21H27N3O2, used in the prophylaxis and treatment of migraine and cluster headaches.
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Origin of methysergide

1960–65; meth- + (l)yserg(ic) (see lysergic acid) + -ide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018