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laitance

[ leyt-ns ]
/ ˈleɪt ns /
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noun
a milky deposit on the surface of new cement or concrete, usually caused by too much water.
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Origin of laitance

1905–10; special use of French laitance milt, equivalent to lait milk (<Latin lact-, stem of lac) + -ance-ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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