From Glossary of Meteorology


  1. A band in the electromagnetic spectrum that offers maximum transmission and minimal attenuation through a particular medium with the use of a specific sensor.

  2. Open water in a predominantly frozen river.

    It is caused by warmer water from a spring or tributary, or by turbulence over a shoal. See polyn'ya.

  3. (Obsolete.) A term for the chaff used for military countermeasure purposes during World War II.