Breadcrumb Home > Dictionary > Index B beta receptor: Meaning and Definition of Find definitions for: be'ta recep"tor Pronunciation: [key] — Biochem., Physiol. Biochem.,Physiol. a site on a cell, as of the heart, that, upon interaction with epinephrine or norepinephrine, controls heartbeat and heart contractability, vasodilation, smooth muscle inhibition, and other physiological processes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beta ray beta rhythm TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: terraincognita Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language