| spondee | (noun) a metrical unit with stressed-stressed syllables | - |
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| spondylarthritis | (noun) arthritis that affects one or more of the intervertebral joints in the spine | - |
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| spondylitis | (noun) inflammation of a spinal joint; characterized by pain and stiffness | - |
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| spondylolisthesis | (noun) a forward dislocation of one vertebra over the one beneath it producing pressure on spinal nerves | - |
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| sponge | (noun) primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies | Synonyms: parazoan, poriferan |
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| (noun) a follower who hangs around a host (without benefit to the host) in hope of gain or advantage | Synonyms: leech, parasite, sponger |
| (noun) someone able to acquire new knowledge and skills rapidly and easily | Synonyms: quick study |
| (noun) a porous mass of interlacing fibers that forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or cellulose product similarly used | - |
| spongefly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongillafly |
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| sponger | (noun) a follower who hangs around a host (without benefit to the host) in hope of gain or advantage | Synonyms: leech, parasite, sponge |
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| (noun) a workman employed to collect sponges | - |
| spongillafly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongefly |
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| sponginess | (noun) the porosity of a sponge | - |
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| (noun) the property of being able to occupy less space | Synonyms: compressibility, squeezability |
| spongioblast | (noun) any of various columnar epithelial cells in the central nervous system that develop into neuroglia | - |
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| spongioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: glioblastoma |
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| sponsor | (noun) someone who supports or champions something | Synonyms: patron, supporter |
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| (noun) an advocate who presents a person (as for an award or a degree or an introduction etc.) | Synonyms: presenter |
| sponsorship | (noun) the act of sponsoring (either officially or financially) | - |
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| spontaneity | (noun) the quality of being spontaneous and coming from natural feelings without constraint | Synonyms: spontaneousness |
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| spontaneousness | (noun) the quality of being spontaneous and coming from natural feelings without constraint | Synonyms: spontaneity |
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