naphtholsulfonic acid

noun
naph·​thol·​sul·​fon·​ic acid
variants: or chiefly British naphtholsulphonic acid \ -​ˌsəl-​ˌfän-​ik-​, -​ˌfōn-​ \

Medical Definition of naphtholsulfonic acid 

: any of several sulfonic acids derived from the naphthols and used as dye intermediates

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