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histamine blocker

American  

noun

Pharmacology.

  1. any of various substances that act at a specific receptor site to block certain actions of histamine.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.