H-sub·​stance ˈāch-ˌsəb-stən(t)s How to pronounce H-substance (audio)
: a diffusible substance that is thought to be released in the allergic reaction of skin and in the responses of tissue to inflammation and that is held to be similar to histamine or possibly to be histamine itself

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“H-substance.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/H-substance. Accessed 22 Sep. 2023.

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