Relating to or characterized by deposition; tending to deposit or settle; having the quality of being deposited.
From 'deposit' + '-ive' meaning 'tending to' or 'characterized by.' A rare or technical adjective used mainly in scientific contexts.
While 'depositional' is the common scientific term, 'depositive' emphasizes the actual process of depositing—it's an older word that you might find in Victorian-era geology textbooks.
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