Reticulum Syllabification: (Re·tic·u·lum)Pronunciation: /riˈtikyələm/ AstronomyDefinition of Reticulum a small southern constellation (the Net), between Dorado and Hydrus. (as genitive Reticuli /riˈtikyəˌlī/) used with a preceding letter or numeral to designate a star in this constellation:the star Beta ReticuliOrigin:Latin, diminutive of rete 'net'Reticulum in other Oxford dictionaries Definition of Reticulum in the British & World English dictionary