horseradish peroxidase

noun

Histology. an enzyme, isolated from horseradish, that when microinjected can be detected by the colored products of the reaction it catalyzes, used as a tracer, as in tracing the route of a motor neuron from the cell body in the spinal cord to the muscle it innervates.

If you woke up on New Year’s Day feeling as if you had been hit by a truck, you may have sought a hangover remedy with an infamously odd name: the hair of the dog. A morning drink may be the last thing you want after a night of boozing. But that’s exactly what this quirky English expression means. Originally, the expression referred to a method of treating a …

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