(organic chemistry) An aromatic heterocyclic organic compound, C₃N₃(OH)₃, that decomposes on heating to form cyanic acid; it is a prebiotic compound found in stellar dust clouds.

(obsolete) A sailor. / (geology, historical) A proponent of Neptunism.

The study of the supernatural / A belief in occult powers and the hope of controlling them

Produced by the earth. / (geology, of a marine sediment) Derived from the erosion of land-based rocks.