bismuth subcarbonate
noun
bismuth sub·car·bon·ate
| \ -ˌsəb-ˈkär-bə-ˌnāt, -nət
\
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Medical Definition of bismuth subcarbonate
: a white or pale yellowish white powder that is a basic salt of varying composition obtained by reaction of a carbonate with a bismuth salt and used chiefly in treating gastrointestinal disorders, topically as a protective in lotions and ointments, and in cosmetics