Lit., noise. Rev., rumor. Only here, Luk 21:25, where the correct reading is ἤχους, the roaring, and Act 2:2. Heb 12:19 is a quotation from the Septuagint. It is the word used in Act 2:2 of the mighty rushing wind at Pentecost. Mark uses ἀκοὴ, in its earlier sense of a report. The same word occurs in Luke, but always in the sense in which medical writers employed it - hearing or the ears. See Luk 7:1; Act 17:20; Act 28:26. Ἦχος, was the medical term for sound in the ears or head. Hippocrates uses both words together: “the ears (ἀκοαὶ) are full of sound (ἤχου);” and Aretaeus of the noise of the sea, as Luk 21:25.