Webster's English Dictionary

intone

in.tone \in-'to-n\ vb [ME entonen, fr. MF entoner, fr. ML intonare fr. L 
   in-]+ tonus tone 1: to utter in musical or prolonged tones  2: to recite in 
   singing tones or in a monotone  : to utter something in singing tones or in 
   monotone  - in.ton.er n