pasteurize

Borrowed from French pasteuriser, itself built from the name of Louis Pasteur, the inventor of the process, plus the verb-forming suffix -ize.

The facts available don't describe a shift in meaning — the word has named this specific heat-treatment process since it entered English from French.

As a name-plus-suffix formation, it shares its pattern with other -ize verbs built from proper names, though no specific cognate is given in the facts.