(engineering) Any substance that can be cast, as in a mould.

(countable) A surname transferred from the common noun referring to someone who lived in or worked in a castle / (UK, rail transport) Castle class, a class of steam locomotives used on the GWR

Having the colour of a chestnut; chestnut-coloured.

(historical) Someone who draws up astrological figures; an astrologer. / (historical) Someone who adds up figures.

(organic chemistry) A particular ellagitannin.

A surname from Spanish.

A plant of the species Ricinus communis, used in the production of castor oil and of the poison ricin.

(historical) A castle, in the Middle Ages and the Early Modern Era, that guarded a customs post and where tolls were collected.

(organic chemistry) Any of a group of hydroxy-cinnamoylmannopyranosides found in chestnuts of the genus Castanea.

plural of castor oil