sulfonamide
noun
sul·fon·amide
ˌsəl-ˈfä-nə-ˌmīd
-məd;
-ˈfō-nə-ˌmīd
: any of various amides (such as sulfanilamide) of a sulfonic acid
also
: sulfa drug
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Merriam-Webster unabridged
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