| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| missile | (noun) a weapon that is forcibly thrown or projected at a targets but is not self-propelled | Synonyms: projectile |
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| (noun) a rocket carrying a warhead of conventional or nuclear explosives; may be ballistic or directed by remote control | - |
| silence | (noun) the absence of sound | Synonyms: quiet |
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| (noun) a refusal to speak when expected | Synonyms: muteness |
| (noun) the trait of keeping things secret | Synonyms: secrecy, secretiveness |
| (noun) the state of being silent (as when no one is speaking) | - |
| silencer | (noun) a tubular acoustic device inserted in the exhaust system that is designed to reduce noise | Synonyms: muffler |
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| (noun) short tube attached to the muzzle of a gun that deadens the sound of firing | - |
| silene | (noun) any plant of the genus Silene | Synonyms: campion, catchfly |
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| silents | (noun) a movie without a soundtrack | Synonyms: silent movie, silent picture |
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| silenus | (noun) any of the minor woodland deities who were companions of Dionysus (similar to the satyrs) | - |
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| silesia | (noun) a sturdy twill-weave cotton fabric; used for pockets and linings | - |
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| silex | (noun) a pure form of finely ground silica | - |
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