A coffin is a container used to hold a deceased person's body.
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usage
棺 alone means coffin but is often used in compounds: 棺材 (guāncai, the more common word for coffin) and 棺椁 (guānguǒ, inner and outer coffins used for nobles in ancient burials). 棺 is the inner coffin; 椁 is the outer one.