Dictionary entry

ἦχος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἦχος, -ου, ὁ

(also in late and MGr., -εος, τό, Lk 21:25), [in LXX for חָמוֹן, etc.;]

1. a noise, sound: Ac 2:2; ἦ. θαλάσσης, Lk 21:25; σάλπιγγος, He 12:19.

2. a report: seq. περί, Lk 4:37.†