See also: h3, ḫ3, ḥ3, H3+, H3⁺, H₃+, H₃⁺, and H-3 Translingual Noun H3 histamine receptor #3, the third histamine receptor discovered. Alternative form of H-3 Related terms histamine receptorH1H2H4Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads