Covered in or soiled with broth; past participle of an archaic verb meaning to drench or soil with broth.
From the prefix 'em-' (to make or cause to be) plus 'broth' (a liquid food) plus '-elled' (past tense suffix). This is an extremely rare and archaic formation from Middle English.
This word is practically extinct—you might find it in a 16th-century cookbook or tavern record describing a messy meal, but it's the kind of perfectly logical word that language just decided it didn't need.
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