Xbak-bit raghal; doloo: To slander the absent, like a dog biting behind the back, where one cannot see; to go about as a talebearer. "He that backbiteth not with his tongue" (Ps 15:3).
Backbiters bak-bit-~rz (Greek katalaloi: Men who speak against. Vulgate, "detractors" (Rom 1:30).
Backbiting bak-bit-ing: cether: Adj. "a backbiting tongue"; literally, "a tongue of secrecy" (Prov 25:23). katalalia: substantive "a speaking against" (2 Cor 12:20; Wisdom 1:11); "evil speaking" (1 Pet 2:1). glossa trite: "a backbiting tongue" (the King James Version of Ecclesiasticus 28:14,15); more literally translated in the Revised Version (British and American) "a third persons tongue."
T. Rees