laitance

Definitions

Construction

  • In concrete, a weak, crumbly, and dusty surface layer caused by excessive water that has bled to the surface and subsequently weakened it. Over-working the surface during finishing can aggravate the problem. If laitance forms between pours, it must be brushed and washed away.

Food

  • feminine soft roe
http://www.dictionarycentral.com/definition/laitance.html