echometry noun6 •The scientific measurement of sounds or echoes. •The use of reflected sound waves to measure the shape or movement of objects.Lovetskaya (1958) established by echometry that bigeye kilka move away from light with a speed of 7 m/min. — 1975 •The use of ultrasound echos to make biometric measurements (as opposed to making images, which is called medical ultrasound).The acoustics system design for echometry is significantly different from that of tissue-structure mapping in that diffuse backscatter is essential. — 1992 •(no longer used) acoustics; •(no longer used) A hypothetical science of echos.In the Harmonie universelle, Marin Mersenne refers to the fable of Pan and Echo in order to introduce the desideratum of a new science of "echometry” (Mersenne 1636: 50–53). — 2022 •(no longer used) The art of constructing vaults to produce echoes.Blanc, in his Echometry, at the end of his first book of the sphere, teaches the method of making an artificial Echo. — 1788
