(informal, usually with definite article) Electricity; the electricity supply. / (rare, countable) An electric car. / An electric toothbrush. / An electric typewriter.

Any cat of indeterminate breed, with primarily gray or blue fur.

A rare species of deepwater shark, Megachasma pelagios, a filter-feeder, swimming with its large mouth wide open to capture plankton and jellyfish.

(mathematics) A form of bilinear invariant