A homemade device used to smoke marijuana, consisting of a plastic jug with the bottom cut out and immersed in a vat of water, which is then raised to create a vacuum beneath its bowl of lit marijuana.

(physics) An instrument that measures the local acceleration due to gravity (strength of the gravitational field).

A katabatic wind.

The state of apparent weightlessness which occurs in a very low gravity field, or in free fall.

(oil industry) A specific gravity scale measuring the relative density of various petroleum liquids, expressed in degrees.

Boots designed to enable a person to hang upside-down for inversion therapy.

plural of gravity meter

plural of gravity bong

plural of centre of gravity

plural of center of gravity