IPA: //daɪˈɛrɪtɪk//
KK: /daɪˈɛrɪtɪk/
Relating to a sharp or biting quality, often used to describe a tone or manner that is harsh or critical.
Her diaeretic remarks during the meeting made everyone uncomfortable.
Diaeretic is formed from "dia-" (meaning through or across) and "eresis" (from Greek "airesis", meaning choice or taking). The word refers to a method of distinguishing or making choices between different options.
Think of 'choosing' or 'distinguishing' something 'through' — that's what diaeretic means.