/ ˈfreskəʊ; NAmE -koʊ/ noun
( pl. -oes or -os ) [ C , U ] a picture that is painted on a wall while the plaster is still wet; the method of painting in this way
—see also alfresco
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WORD ORIGIN
late 16th cent.: Italian , literally cool, fresh . The word was first recorded in English in the phrase in fresco , representing Italian affresco , al fresco on the fresh (plaster).