Tending to evert or turn outward; relating to or causing eversion.
From everse plus the adjective-forming suffix -ive. This technical term emerged in medical and anatomical literature.
The -ive suffix creates adjectives meaning 'tending to do something,' so 'eversive' means 'tending to turn outward'—it's how English creates endless variations on a core idea using just a few productive suffixes.
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