Placed in or enclosed within a coffin; prepared for burial.
From 'coffin' (from Old French cofin, meaning chest/basket, from Latin cophinus via Greek) plus '-ed' (from Old English -ed). The adjective form indicates something that has been put in a coffin.
The word 'coffined' appears in Shakespeare and older poetry, and it's interesting how it shifted meaning from 'put in any chest' to specifically 'prepared for burial'—language tracking how death rituals changed!
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