| sip | (noun) a small drink | - |
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| siphon | (noun) a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled | Synonyms: syphon |
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| (noun) a tube running from the liquid in a vessel to a lower level outside the vessel so that gravity forces the liquid through the tube | Synonyms: syphon |
| siphonophore | (noun) a floating or swimming oceanic colony of polyps often transparent or showily colored | - |
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| sipper | (noun) a drinker who sips | - |
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| sipunculid | (noun) small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut | Synonyms: peanut worm |
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