Monophonic

Origin

- + phonic + -

Adjective

adjective

(of sound reproduction) having a single channel; monaural (compare stereophonic)
(music) having a single melodic line and no harmony (compare polyphonic)
(orthography) having simple one-to-one mapping between letters and phonemes

1828, 7th July, Peter S. Du Ponceau, On some Points connected with the Nature of the Chinese Language, From a similar selection, says M. Remusat, the Coreans have made a monophonic alphabet of nine vowels and fifteen consonants