Calcite, the most common form of natural calcium carbonate (CaCO3), a widely distributed mineral known for the beautiful development and great variety of its crystals.
A wavefront is a surface over which an optical wave has a constant phase. For example, a wavefront could be the surface over which the wave has a maximum (the crest of a water wave, for example) or a minimum (the trough of the same wave) value. The shape of a wavefront is usually determined by the geometry of the source.
Noun. 1. wave-one of a series of ridges that moves across the surface of a liquid (especially across a large body of water). moving ridge. motion, movement-a natural event that involves a change in the position or location of something. breakers, surf, breaker-waves breaking on the shore.