Noun | 1. | ![]() aquarium, fish tank, marine museum - a tank or pool or bowl filled with water for keeping live fish and underwater animals water tank, cistern - a tank that holds the water used to flush a toilet gas holder, gasometer - a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel reservoir - tank used for collecting and storing a liquid (as water or oil) septic tank - large tank where solid matter or sewage is disintegrated by bacteria vessel - an object used as a container (especially for liquids) |