liquitabEtymologyFrom liquid tab. Formerly a trademark in the United States, registered in 1966.liquitab means A capsule containing detergent for use in washing machines or dishwashers. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA capsule containing detergent for use in washing machines or dishwashers.“The Bold 2in1 range now includes a liquitab.”