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).
References in periodicals archive ?
there is no known dispersal agent for neotropical cycads, and the
Because he's failed to produce the full, progressive disease in monkeys by dosing them with BMAA, he's now pursuing cycasin, another cycad compound.
Proceedings of the Third International Conference on Cycad Biology.
International Conferences on Cycad Biology (Stevenson et al.
Fossil Cycad is a compelling story, and the more that we look into it, the more we find a lot of lessons learned, which can guide us today to protect nonrenewable resources that have not yet disappeared.
The authors produced a 23-page document, including a table of scientific names, localities and vernacular names of African, American, Asian and Oceanic cycads.
About the same time, Cox and Banack made another advance, discovering that BMAA was produced by cyanobacteria that lived as symbionts in specialized roots of the cycads.
5 million years ago and found there was a gap of 55 million years between when dinosaurs were extinct and modern cycads started to diversify," Dr Nagalingum said.
This cycad is a prominent tree in the forests of the several islands within the western Caroline Islands and Mariana Islands.
Pollen is the male non-flagellated, gametophytic cell found in most vascular plants from Cycads to palms; the spore producing ferns and lycophytes are a bit different.