noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An acoustic calibrator based on a piston pushing on a fixed volume of air.
2. 2
   an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. wordnet

Etymology

From piston + -phone.

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