Any of various aquatic insects of the family Corixidae that have paddle-shaped hind legs used for swimming.

Any of various freshwater aquatic beetles that have a smooth oval body and flattened hind legs adapted for swimming, and that carry an air bubble underneath their abdomens.

An appliance for heating water above its ambient temperature, generally for domestic use.

any water containing dissolved salt; brine

(dentistry) A device that is used to clear away food debris from the mouth, mostly used by people with braces or periodontal problems.

(uncountable) The location of high tide on a coastal area. / The state of the tide when the water is at its highest. / (countable) The highest stage of a river.

A glass column that displays water levels.

(idiomatic) To explore or probe, as before making a commitment.

A device for measuring time by letting water flow out of a container, usually through a tiny aperture. / A clepsydra.

(idiomatic, figuratively) A dangerous situation; trouble. / (idiomatic, figuratively) fierce criticism / Used other than figuratively or idiomatically: see hot, water.