Absence of hours or time.

every two hours

alternative form of bihourly

(electrical engineering, rail transport) A measure of the maximum output, usually expressed in horsepower, that can be obtained from the motors of an electric locomotive for a period of one hour without the motors overheating.

plural of hourly rating

plural of hourglass drum

(music) A drum (membranophone) with an hourglass-like shape.

Alternative form of semihourly.

The face of a clock, on which the hours are numbered.

plural of hourplate