Originally: (more fully "quartz-resinite") a siliceous material of resinous or opaline appearance. In later use: fossilized resin, especially as a constituent (maceral) of coal, in which it typically occurs as elliptical or spindle-shaped bodies.
historical, rare A synthetic resin produced by the condensation of phenol and formaldehyde. Compare "resite".
Early 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From resin + -ite.