Any member of the Chelicerata.

A surname. / (astronomy, obsolete) The planet Uranus. In use until the mid-19th century as an alternative to Georgium Sidus after King George III.

(rail transport) A bogie used to carry a railway carriage on a line of different gauge to the one it was built for, usually a narrower gauge.

(chemistry) A parent compound whose name implies stereochemistry that need not be explicitly stated.