A metric unit of catalytic activity equal to 100 katals, representing the amount of a catalyst that increases the rate of a chemical reaction by 100 moles per second. The symbol is hkat. The base katal is already a massive unit for biological processes, making the hectokatal strictly theoretical and virtually unseen in biochemical or clinical laboratory practice.
Heard on the job
A reaction rate of a hectokatal would require an industrial-scale catalytic reactor.