To perform experiments on something; to conduct or carry out experiments; to test or treat experimentally.
From experiment + -ize (suffix creating verbs meaning 'to make' or 'to perform'). The -ize suffix is highly productive in English for converting nouns into verbs. This is a rare or archaic form.
When you 'experimentize' something, you're putting it through the scientific method—it's a more formal way of saying 'let's experiment on this,' and while uncommon today, it reminds us that English constantly creates new verbs from nouns!
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