To delineate or outline something carefully, or in some technical contexts, to remove or strip away.
Possibly a variant or rare form of 'delineate' (from Latin de- + linea, 'line'), though this spelling is archaic and extremely rare in modern English. The confusion likely arose from similar Latin prefixes and phonetic similarity.
This word is so obscure that it barely appears in historical records—it represents the kind of ghost word that lexicographers find hiding in old dictionaries, created by printing errors or misreadings that somehow got quoted as if real.
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