Relating to, causing, or characterized by distension; tending to stretch or expand.
From distension + -ive (suffix meaning 'tending to' or 'relating to'). The -ive suffix comes from Latin and creates adjectives from nouns.
The -ive suffix is productive in English—we can add it to create adjectives like 'creative,' 'destructive,' 'descriptive'—and 'distensive' follows that same pattern to describe something that tends toward distending.
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