"A voxel represents a value on a regular grid in three-dimensional space. [...] The word voxel originated by analogy with the word "pixel", with vo representing "volume" and el representing "element""
- from Wikipedia

"These cells are often called voxels (volume elements), in analogy to pixels."
- in the book Computer Graphics: Principles and Practice

"A cubic 3D equivalent to the square 2D pixel. The name is a combination of the terms "Volumetric" and "Pixel". Used to store smoke and fire data from physics simulations."
- from the Blender manual

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