Technical term in physics and engineering for electromagnetic waves with wavelengths between about 1 mm and 1 m. In everyday contexts, often refers to microwave ovens or microwave radiation.
Microwaves are used in communications and radar.
A microwave oven heats food using microwaves.
microwave heating
microwave landing system; MLS
microwave background radiation
Compound of マイクロ (from English 'micro') and 波 (wave), a direct calque of 'microwave'.