Third-person singular present tense: he/she/it poisons or fills with venom or malice.
Third-person singular form of 'envenom' created by adding '-s'. In modern English, this is simply the base verb conjugated for present tense with non-first-person subjects.
'She envenoms his thoughts with doubt'—this verb form is found mostly in literature rather than everyday speech, giving it an almost poetic quality.
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