Definitions for "Metamaterial"
A metamaterial (or meta material) is a material that gains its properties from its structure rather than directly from its composition. This term is particularly used when the material has properties not found in naturally-formed substances. Metamaterials are of particular importance in electromagnetism (especially optics and photonics), where metamaterials are promising for a variety of optical and microwave applications, such as new types of beam steerers, modulators, band-pass filters, lenses, microwave couplers, and antenna radomes.