| ellipsoid | (noun) a surface whose plane sections are all ellipses or circles | - |
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| medusoid | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusan |
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| sinusoid | (noun) tiny endothelium-lined passages for blood in the tissue of an organ | - |
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| (noun) the curve of y=sin x | Synonyms: sine curve |
| virusoid | (noun) the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat | Synonyms: viroid |
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