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Medical Definition of P-chloromercuribenzoate
1. Organic mercury compound (ClHgC6H4COO-, ClHgBzO-) that reacts with -SH groups of proteins; an inhibitor of action of those proteins (enzymes) that depend on -SH reactivity. See: p-mercuribenzoate. Acronym: PCMB (05 Mar 2000)