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Becoming or growing fat; (in extended use) flourishing. Also of a food: greasy, fattening.
Late 18th century; earliest use found in Robert Southey (1774–1843), poet and reviewer. From classical Latin pinguēscent-, pinguēscēns, present participle of pinguēscere to grow fat, to become oily or fatty from pinguis fat + -ēscere.