The word "gastrosan" is spelled phonetically as /ɡæstroʊsæn/. The first syllable is pronounced with a hard "g" sound followed by the vowel sound "æ" and then the consonant cluster "str". The second syllable starts with a long "o" sound and is followed by another vowel sound "æ". Finally, the word ends with an "n" sound. "Gastrosan" is a made-up word and has no actual meaning or definition in the English language.
Trade name of a white insoluble powder said to be the bisalicylate of bismuth; recommended in cases of atony of the stomach with hypersecretion, in doses of gr. 12 (0.8).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.