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Use "hexahedral" in a sentence
"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."