| siege | (noun) the action of an armed force that surrounds a fortified place and isolates it while continuing to attack | Synonyms: beleaguering, besieging, military blockade |
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| siemens | (noun) a unit of conductance equal to the reciprocal of an ohm | Synonyms: mho, reciprocal ohm, S |
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| sienna | (noun) an earth color containing ferric oxides; used as a pigment | - |
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| sierra | (noun) a Spanish mackerel of western North America | Synonyms: Scomberomorus sierra |
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| (noun) a range of mountains (usually with jagged peaks and irregular outline) | - |
| siesta | (noun) a nap in the early afternoon (especially in hot countries) | - |
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| sieve | (noun) a strainer for separating lumps from powdered material or grading particles | Synonyms: screen |
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