cyclometer

English

Etymology

cyclo- +‎ -meter

Noun

cyclometer (plural cyclometers)

1. (cycling) A device that counts the revolutions of a bicycle wheel in order to indicate distance travelled.

   Synonym: cyclocomputer

   • 1887, Thomas Stevens, chapter IX, in Around the World on a Bicycle‎^[1], Vol. I: From San Francisco to Teheran, London: Sampson Low […] , pages 244–246:

     While here at Constantinople I received by mail from America a Butcher spoke cyclometer, and on the second visit to Prinkipo I measured the road which has been made around half the island; the distance is four English miles and a fraction.

2. An instrument for measuring circular arcs.
3. (historical) A machine used to decrypt Enigma machine ciphers.