A tool employing a chamber with a colored liquid and an air bubble, used to determine if a surface is level horizontally, vertically, or at a 45-degree angle.

(rail transport, informal) a single-car multiple unit / A small three-wheel motor vehicle in a category between a motorbike and a car

plural of bubble bath

plural of hubbly bubbly

plural of bubble ass

(US, slang) A bubble butt.

A rounded or cloud-shaped outline, usually containing words, representing thought in a cartoon. / (idiomatic) An ill-conceived idea.

plural of bubble car

plural of bubble chamber

A vessel filled with a superheated transparent liquid (most often liquid hydrogen) used to detect electrically charged particles moving through it.