sibilant (adj.)youdaoicibaDictYouDict[sibilant 词源字典]
1660s, from Latin sibilantem (nominative sibilans), present participle of sibilare "to hiss, whistle," possibly of imitative origin (compare Greek sizein "to hiss," Lettish sikt "to hiss," Old Church Slavonic svistati "to hiss, whistle"). Related: Sibilance; sibilation (1620s).[sibilant etymology, sibilant origin, 英语词源]
sibilant (n.)youdaoicibaDictYouDict
"speech sound having a hissing effect," 1772, from sibilant (adj.).