a electromagnetic radiation in the wavelength range 0.3 to 0.001 metres: used in radar, cooking, etc.
b (as modifier)
2 short for →
3 to cook in a microwave oven
n a background of microwave electromagnetic radiation discovered in space in 1965, believed to have emanated from the big bang with which the universe began
n a device for recording the speed of a motorist
n an oven in which food is cooked by microwaves, (Often shortened to)
n a type of spectroscopy in which information is obtained on the structure and chemical bonding of molecules and crystals by measurements of the wavelengths of microwaves emitted or absorbed by the sample
microwave spectroscope n
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"