A fossil foraminiferan of the genus Siderolites, typically having points or lobes radiating from a discoid shell giving a more or less star-shaped appearance.
Early 19th century; earliest use found in Abraham Rees (1743–1825), Presbyterian minister and encyclopaedist. From (i) French sidérolite.
A meteorite composed of a mixed mass of metal (mainly iron-nickel alloy) and silicate minerals.
Mid 19th century. From sidero- + -lite.