Basic Guidelines For English Spellings
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A ceremony carried out some time after the funeral of an individual, at which the grave is sealed with a tomb or cover.
Early 19th century (in an earlier sense). From tomb + -ing.
That entombs a person or thing; that envelops or encloses in the manner of a tomb.
Early 19th century; earliest use found in Philomathic Journal. From tomb + -ing.