heterogeneous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Consisting of dissimilar elements or parts; not homogeneous. synonym: miscellaneous.
• adjective Xenogeneic.

from The Century Dictionary.

• Different in kind; widely dissimilar; unlike; foreign; incongruous.
• Composed of parts of different kinds; having widely unlike elements or constituents: opposed to homogeneous.
• The attraction between the different kinds of electricity and magnetism.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Differing in kind; having unlike qualities; possessed of different characteristics; dissimilar; -- opposed to homogeneous, and said of two or more connected objects, or of a conglomerate mass, considered in respect to the parts of which it is made up.
• adjective (Gram.) nouns having different genders in the singular and plural numbers; as, hic locus, of the masculine gender in the singular, and hi loci and hæc loca, both masculine and neuter in the plural; hoc cælum, neuter in the singular; hi cæli, masculine in the plural.
• adjective (Math.) such quantities as are incapable of being compared together in respect to magnitude, and surfaces and solids.
• adjective (Math.) surds having different radical signs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Diverse in kind or nature; composed of diverse parts.
• adjective mathematics Incommensurable because of different kinds.
• adjective physics Having more than one phase (solid, liquid, gas) present in a system or process.
• adjective chemistry Visibly consisting of different components.
• adjective computing Of a network comprising different types of computers, potentially with vastly differing memory sizes, processing power and even basic underlying architecture; alternatively, of a data resource with multiple types of formats.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective consisting of elements that are not of the same kind or nature
• adjective originating outside the body