quar·ter·tone 
(kwôrtər-tōn′)
(kwôrtər-tōn′)n.
Half a semitone.
- submergible
- submerse
- submersed
- submersible
- submersion
- submicroscopic
- submicroscopically
- submillimeter radiation
- subminiature
- subminiaturization
- subminiaturize
- subminimum wage
- submiss
- submission
- submissive
- submissively
- submissiveness
- submit
- submittal
- submitter
- submontane
- submucosa
- submucosal
- submucosally
- submultiple