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one of the cycad genera from Australia, Asia, the Pacific and eastern Africa. Includes C. armstrongii (C. lane-poolei), C. angulata, C. basaltica, C. media, C. circinalis, C. revoluta. They contain the cycad glycoside cycasin. The leaves cause incoordination when eaten by cattle; see zamia staggers. The seeds may also cause severe gastroenteritis and hepatic necrosis. Seeds of C. circinalis are also eaten by humans as guam and may cause a degenerative disease of the nervous system in them. Called also zamia.