(bicycle racing) A mass-start road-cycle race somewhat similar to a criterium in that it consists of several laps of a closed circuit, but where the length of each circuit or lap is slightly longer, up to a couple of miles per lap.

A board on which electronic components and their interconnecting circuits are mounted or etched

(mathematics) The problem, proposed by ancient Greek geometers, of using a finite ruler-and-compass construction to make a square with the same area as a given circle.

(physics) A pair of fundamental natural laws dealing with the relations of currents at a junction and the voltages around a loop.

a form of cylindrical motion found in the near-surface waters of lakes and oceans under windy conditions, characterized by lines or streaks of seaweed etc (called windrows) roughly parallel to the wind

a circle formed by a plane that cuts a sphere not through its centre

Disruption to the body's biological clock caused by a sudden shift in daily rhythm.

(medicine, sciences) The removal of the clitoral hood, the female prepuce cognate to the foreskin removed in the male equivalent.

(netball) One of two semicircles in the goal thirds, radius 4.9 metres, in which the goal shooter and goal attack can shoot.

A traffic intersection in the West End of London, having connections with Piccadilly, Regent Street, Shaftesbury Avenue, Haymarket, Coventry Street and Glasshouse Street; proverbially visualised as being very busy with people.