Voxel definitions

vŏk'səl
The basic unit of a three-dimensional digital representation of an image or object.
noun
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(VOlume piXEL) A three-dimensional pixel. A voxel represents a quantity of 3D data just as a pixel represents a point or cluster of points in 2D data. It is used in scientific and medical applications that process 3D images.
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(computer graphics) The three-dimensional analogue of a pixel; a volume element representing some numerical quantity, such as the colour, of a point in three-dimensional space, used in the visualisation and analysis of three-dimensional (especially scientific and medical) data.
noun
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Origin of voxel

Blend of volume and element or volumetric and pixel.