consonant: [14] Etymologically, consonant means ‘sounding together’. It comes via Old French consonant from Latin consonāns, the present participle of consonāre, a compound verb formed from the prefix com- ‘together’ and sonāre ‘sound’. Its application to particular speech sounds, contrasted with ‘vowels’, comes from the notion that they were ‘pronounced together with’ vowels, rather than independently. => sonorous, sound[consonant etymology, consonant origin, 英语词源]