cycad

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cycad

(sī′kad″, kăd) [L. Cycas, a genus name]
A variety of palmlike evergreen plants, including Cycas revoluta and C. circinalis, from which cycasin has been isolated.

cycad

any tropical or subtropical GYMNOSPERM of the order Cycadales. Cycads date from the MESOZOIC PERIOD. Present-day forms grow to 20 m in height and have a crown of fern-like leaves. They live for up to a thousand years.

cycad

a member of the plant genus of cycas, dioecious, non-flowering woody plants (gymnosperms) which produce seeds in a woody cone consisting of exposed seed leaves (sporophylls), not enclosed in an ovary. The leaves are usually in a rosette at the top of the stem, which may be subterranean. Include Bowenia, Cycas, Dioon, Encephalartos, Lepidozamia, Macrozamia, Zamia spp.

cycad glycoside
group of glycosides including cycasin, macrozamin, found in cycad plants; oxidized in vivo to release toxin methylazoxymethanol (MAM).