pit(redirected from pit and fissure sealant)
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pitChiefly US and Canadian
a shallow (up to 25 m deep) vertical or, less often, inclined mining excavation that is sunk from the surface. Pits are used for various purposes, such as the exploration of mineral deposits, ventilation, the raising of water, the hauling of materials, and the lowering and hoisting of people.
What does it mean when you dream about a pit?
A pit is something we fall into, get stuck in, and have difficulty getting out of, so dreaming about being in a pit could reflect these feelings. We also talk about being in a “bottomless pit” or taking a “pit stop.” (See also Cave, Hole).
pitAn indentation in an optical medium such as a CD-ROM or DVD. The laser beam is either absorbed in the pit or reflects off the non-indented areas, which are called "lands." Using various algorithms, the reflections are converted into 0 and 1 bits.
|Pits and Lands|
|This microscopic view of a CD-ROM and DVD disc compares the track density and pits and lands, which account for 7.5 times as much data on the DVD. (Image courtesy of C-Cube Microsystems.)|