An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Composed of parts of different kinds; having widely dissimilar elements or constituents. See also → homogeneous, → inhomogeneous.
2) Chemistry: A mixture that does not have uniform composition and properties throughout; composed of different substances or the same substance in different phases.

→ hetero- + -genous, → homogeneous.