Abbott-Smith Manual Greek Lexicon
ἑτερό-γλωσσος (G2084)
1 **† ἑτερό-γλωσσος (Att. -ττος ), -ον , [in Aq.: Ps 113 (114):1 , Is 33:19 * ;] of alien speech, of another tongue (v. Cremer, 681): I Co 14:21 (aliter in LXX).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain