echometry

== English == === Etymology === From echo +‎ -metry, compare French échométrie. === Noun === echometry (uncountable) (obsolete) acoustics; The art of constructing vaults to produce echoes. A hypothetical science of echos. The scientific measurement of sounds or echoes. The use of reflected sound waves to measure the shape or movement of objects. (medicine, ophthalmology) The use of ultrasound echos to make biometric measurements (as opposed to making images, which is called medical ultrasound). ==== Derived terms ==== === Anagrams === chyometer