keystone

IPA: kˈistoʊn

(transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
(transitive, retail) To double the cost price in order to determine the retail price; to apply a markup of 100%.

Examples of "keystone" in Sentences

At its simplest, a keystone is a device for harvesting and storing power.
Along with home ownership, the BA is described as a keystone to the American Dream.
But Pennsylvania's so critical in presidential politics, it's fitting that it be called the keystone state.
Plants are also described as keystone mutualists, which provide critical support to pollinators and dispersers.
Wolves are called keystone predators, because their presence or absence has a radical effect on a whole complex eco-system.
Someone has to hold the arch together while the keystone is put in place, or they are thrown together at a single time improbably falling neatly into place.
The Dell M109S includes a capability called keystone correction, a standard feature in most projectors that adjusts a projected image to give it the proper dimensions, rather than the trapezoidal shape that results when a projector is angled upward.
The more forward thinkers concerned themselves with population viability, not just with small areas versus large ones, and explored the notion of keystone species, meaning those plants and animals that might be especially crucial to maintaining the cohesion of an entire ecological community over time.