IPA: //ˌbærɪˈtoʊnəl//
KK: /bɛrɪˈtoʊnəl/
Relating to or characteristic of a baritone voice, which is a type of male singing voice that is lower than tenor but higher than bass.
The baritonal quality of his voice made him perfect for the role in the opera.
Baritonal is formed from "baritone" (from Italian "baritono", meaning low or deep voice) and the suffix "-al" (meaning pertaining to). The word "baritonal" refers to something that pertains to or is characteristic of a baritone voice.
Think of 'baritone' as a deep voice, and the '-al' means relating to it — so baritonal describes something related to that deep voice.