spectrogram
noun
- visual representation of the spectrum of frequencies in a sound or other signal as they vary with time or some other variable
Wiktionary
Pronunciation: /ˈspɛktɹəˌɡɹæm/
noun
Etymology: From spectro- + -gram.
- A visual representation of the spectrum of a sound changing through time.
- A visual representation of the spectrum of a celestial body's radiation.