rd

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English

Definitions

In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad

Anything which radiates or emits rays.
A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.
(of buildings) A finned metal fixture that carries hot water or steam in order to heat a room.
A type of antenna.

A way used for travelling between places, originally one wide enough to allow foot passengers and horses to travel, now (US) usually one surfaced with asphalt or concrete and designed to accommodate many vehicles travelling in both directions. In the UK both senses are heard: a country road is the same as a country lane.
A road; or particularly a car, as a means of transportation.“We travelled to the seaside by road.”
A path chosen in life or career.
An underground tunnel in a mine.

A circular or spherical object or part of an object.
A circular or repetitious route.“The guards have started their rounds; the prisoner should be caught soon.”
A general outburst from a group of people at an event.“The candidate got a round of applause after every sentence or two.”
A song that is sung by groups of people with each subset of people starting at a different time.