The Collaborative International Dictionary
Barocyclonometer
Barocyclonometer \Bar`o*cy`clon*om"e*ter\, n. [Gr. ba`ros weight + cyclone + -meter.] (Meteorol.) An aneroid barometer for use with accompanying graphic diagrams and printed directions designed to aid mariners to interpret the indications of the barometer so as to determine the existence of a violent storm at a distance of several hundred miles.
Wiktionary
barocyclonometer
n. (context nautical English) A type of aneroid barometer that has accompanying diagrams and directions that help predict storms