Sort of, in modern parlance, ‘microwave’ can be a verb meaning ‘to cook using microwaves’, and these days the common meaning of the noun ‘microwave’ means the cooking device. Originally, (and to many scientists still) “microwaves” meant electromagnetic waves with a wavelength of somewhere between a millimetre and tens of centimetres (‘micro’ indicating that they have a smaller wavelength than your average radio wave).
It just so happens that microwaves with approximately a 12cm (~4") wavelength do a really good job of heating up water, and our food is mostly water. The rest of the machine is there to stop the microwaves getting out and heating up all the water in your body (this would be bad).
A good example of jargon crossing over into modern English, and having it’s meaning subtly changed along the way.
