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echo +‎ -meter


echometer (plural echometers)

  1. A graduated scale for measuring the duration of sounds and determining the relation of their intervals.
    (Can we find and add a quotation of J. J. Rousseau to this entry?)


Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for echometer in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)