Similar words: squad, quadrate, quadrant, quadratic, quadruped, quadruplet, vice squad, quadrille. Meaning: [kwɑd /kwɒd] 
n. 1. one of four children born at the same time from the same pregnancy 2. a muscle of the thigh that extends the leg 3. (printing) a block of type without a raised letter; used for spacing between words 4. a rectangular area surrounded on all sides by buildings.
n. 1. one of four children born at the same time from the same pregnancy 2. a muscle of the thigh that extends the leg 3. (printing) a block of type without a raised letter; used for spacing between words 4. a rectangular area surrounded on all sides by buildings. 
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61. First, it is always possible circumscribe a sphere in a camera - aligned quad.
62. All kinds of method used around world and presented approach based on interval arithmetic and quad tree was presented.
63. Quad voltage comparators for square wave generator, time delay generators, pulse generators and etc.
64. You can easily draw four-sided polygons in Processing with quad.