A bag used in vacuum cleaners to collect the dirt.

plural of vacuum bag

(logic) A proposition which is true only because it is a conditional statement with a necessarily false premise, or which asserts a property of all elements of an empty domain of discourse.

plural of vacuous truth

(gambling) In roulette, an announcement made by the croupier while the wheel is spinning and no more bets can be placed.

(cosmology) The disagreement of over 100 orders of magnitude between measured values of the vacuum energy density and the theoretical zero-point energy suggested by a naïve application of quantum field theory.

plural of vacuum aspiration

Opposing vaccines and vaccination.

(informal) The labia majora.

plural of vacuum desiccator