Saturday, 3 October 2026

The name penicillin comes from Latin penicillus, brush, and is related to the word penis

The name penicillin comes from Latin penicillus, brush, and is related to the word penis

Penicillin is so called because of its appearance: under the microscope, a colony of Penicillium looks like a brush. The name of the genus, Penicillus, comes from the Latin penicillus, "paintbrush". Oddly enough, penicillin is a kinsman of the word penis, from the Latin penis, "tail". Penicillus, accordingly, a "little tail", alludes to the tufts of hair that have long been used to make brushes.

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