Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Ranitidine" Definition
noun
An antagonist for one of two types of histamine receptors occurring on the surfaces of cells, especially gastric cells, that inhibits gastric acid secretion and is used primarily in the treatment of duodenal ulcers, gastric ulcers, and gastroesophageal reflux disease.
Source: American Heritage Dictionary
A histamine blocker CHNOS that is administered in the form of its hydrochloride to inhibit gastric acid secretion.
Source: Merriam-Webster
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