a milky deposit on the surface of new cement or concrete, usually caused by too much water.

1905–10; special use of French laitance milt, equivalent to lait milk (< Latin lact-, stem of lac) + -ance -ance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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More from Translator Word FAQs presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
Remove all laitance, loose material, and rebound by brooming or scraping.
Verify concrete is clean and free of laitance, grease, oil and contaminants.
Proper preparation should produce a slightly textured surface profile while
  removing all contamination and laitance.
At development of initial set, lightly broom surface to remove any laitance to
  provide better bond with succeeding applications.
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