One of the mysteries of the English language finally explained.
A resin obtained in Australia from some kinds of grass tree, used in making varnish.
- ‘The solution of the acaroid resin is yellow and yields with lead acetate a precipitate, while the solutions of the other two resins are red, that of X. quadrangulare being not disturbed by acetate of lead, while that of X. arborea produces with the same reagent a turbidity; the chloroformic solution of the latter is yellow, that of the former colorless.’
- ‘In this second composition, the acaroid resin is included as a burning rate modifier and the potassium nitrate to improve the effect of the resin.’
Mid 19th century: of unknown origin.
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