Definition of mel in US English:

mel

noun

Acoustics
  • A unit of subjective pitch, on a scale that is proportional to the pitch of a sound, the pitch of a note of frequency 1000 Hz being equal to 1000 mels.

Origin

1930s; earliest use found in Stanley Smith Stevens (1906–1973). Shortened from melody.

Pronunciation

mel

/mɛl/