- a fungus of the genus Geaster, having an outer covering that splits into the form of a star.
- any of various bromeliads of the genus Cryptanthus, native to Brazil, having rosettes of stiff, prickly leaves.
- any of various basidiomycetous saprotrophic woodland fungi of the genus Geastrum, whose brown onion-shaped reproductive body splits into a star shape to release the spores
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