Definition of "hexahedral" []

• Having six plane surfaces (adjective)

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• "The crystals of both are almost invariably regular hexahedral prisms, sometimes slightly modified."
• "One of the masses of ice which he describes was crystallised in prisms of various numbers of sides: of these prisms the greater part were hexahedral and irregular."
• "The French Encyclopædia [202] relates that M. Hassenfratz saw ice served up at table at Chambéry which broke into hexagonal prisms; and when he was shown the ice-houses where it was stored, he found considerable blocks of ice containing hexahedral prisms terminated by corresponding pyramids."