Home › Words › M › macquariummacquarium/ˌmækˈkwɛɚ.i.jəm/macquarium means an aquarium (fish tank) constructed using the case of a defunct Macintosh personal computer.macquarium is pronounced /ˌmækˈkwɛɚ.i.jəm/.EtymologyBlend of Mac + aquarium, coined by computer writer and Macquarium creator Andy Ihnatko (originally as a joke regarding the approaching obsolescence of early Compact Macintosh models).nounAn aquarium (fish tank) constructed using the case of a defunct Macintosh personal computer.Definitions & examples from Wiktionary (CC BY-SA 3.0).