adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   anechoic, soundless
2. 2
   Describing the upper reaches of the atmosphere, and of space, in which the concentration of molecules is too small to support the propagation of sound

Etymology

From an- + acoustic.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.