
An organized mass of tropical thunderstorms, with a slight cyclonic circulation, and winds less than 20 knots.
Found on
http://ggweather.com/glossary.htm

An organized mass of thunderstorms in the tropics than lasts for more than 24 hours, has a slight cyclonic circulation, and winds less than 23 mph.
Found on
http://www.encyclo.co.uk/local/22268

A discrete tropical weather system of apparently organized convection -- generally 100 to 300 nmi in diameter -- originating in the tropics or subtropics, having a nonfrontal migratory character, and maintaining its identity for 24 hours or more. It may or may not be associated with a detectable perturbation of the wind field.
Found on
http://www.mmsn.org/resources/glossary.html

An organized group of thunderstorms often found over a tropical ocean that generates a slight cyclonic flow of less than 37 kilometers per hour. Can develop into a hurricane.
Found on
http://www.physicalgeography.net/physgeoglos/t.html

A discrete system of apparently organized convection originating in the tropics or subtropics, having a non-frontal migratory character and maintaining its identity for 24 hours or more.
Found on
http://www.stormfax.com/wxwords.htm

A discrete system of apparently organized convection originating in the tropics or subtropics, having a non-frontal migratory character and maintaining its identity for 24 hours or more.
Found on
https://www.encyclo.co.uk/local/21131
No exact match found.