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The Collaborative International Dictionary
Echometry

Echometry \E*chom"e*try\, n. [Cf. F. ['e]chom['e]trie.]

  1. The art of measuring the duration of sounds or echoes.

  2. The art of constructing vaults to produce echoes.

Wiktionary
echometry

n. 1 The measurement of the duration of sounds or echoes. 2 The art of constructing vaults to produce echoes.