ˌsəlˈfänəˌmīd, -fōn-, ˌsəlfəˈnaˌm-, -_mə̇d noun
Etymology: sulfon- + amide
: the amide of a sulfonic acid characterized by the grouping −SO 2 N
benzene- sulfonamide C 6 H 5 SO 2 NH 2
especially : sulfa drug
the bacteriostatic action of sulfonamides is antimetabolite in nature — U.S. Dispensatory
— see sulfanilamide