| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| rhizoid | (noun) any of various slender filaments that function as roots in mosses and ferns and fungi etc | - |
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| rhizoidal | (adjective) of or relating to a rhizoid | - |
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| rhizomatous | (adjective) producing or possessing or resembling rhizomes | - |
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| rhizome | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rootstalk, rootstock |
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| rhizomorph | (noun) a dense mass of hyphae forming a root-like structure characteristic of many fungi | - |
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| rhizopod | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopodan |
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| rhizopodan | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopod |
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| rhizopus | (noun) any of various rot causing fungi of the genus Rhizopus | - |
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| rhizotomy | (noun) surgical procedure in which spinal nerve roots are cut; done (anterior roots) to relieve intractable pain or (posterior roots) to stop severe muscle spasms | - |
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