K5E1Y4S1T1O1N1E1S1
16 points
KEYSTONES is validvalid
KEYSTONE, the central stone of an arch [n]
KEYSTONE, to produce a distortion of a television picture in which a rectangular pattern is transformed into a trapezoidal pattern [v]
KEYSTONE, the central stone of an arch [n]
KEYSTONE, to produce a distortion of a television picture in which a rectangular pattern is transformed into a trapezoidal pattern [v]