Abbott-Smith Manual Greek Lexicon
αἴνιγμα (G135)
1 αἴνιγμα , -ατος, τό ( αἰνίσσομαι , to speak in riddles ; αἰνός = δεινός , dread , strange ), [in LXX for חִידָה , Nu 12:8 and always exc. De 28:37 ( שַׁמָּה );] a dark saying , riddle : I Co 13:12 (cf. Nu 12:8 ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain