descant (v.) Look up descant at Dictionary.com
mid-15c.; see descant (n.). Sense of "to comment at length" is first attested 1640s.
descant (n.) Look up descant at Dictionary.com
late 14c., from Old North French descant (Old French deschant), from Medieval Latin discantus "refrain, part-song," from Latin dis- "asunder, apart" (see dis-) + cantus "song" (see chant). Spelling was partly Latinized 16c. Originally "counterpoint."