| sciaenid | (noun) widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound | Synonyms: sciaenid fish |
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| sciara | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciarid |
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| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| sciatica | (noun) neuralgia along the sciatic nerve | - |
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| science | (noun) a particular branch of scientific knowledge | Synonyms: scientific discipline |
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| (noun) ability to produce solutions in some problem domain | Synonyms: skill |
| scientist | (noun) a person with advanced knowledge of one or more sciences | - |
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| scilla | (noun) an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers | Synonyms: squill |
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| scillaren | (noun) a crystalline steroidal glycoside present in squill (Drimia maritima). | - |
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| scimitar | (noun) a curved oriental saber; the edge is on the convex side of the blade | - |
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| scincid | (noun) alert agile lizard with reduced limbs and an elongated body covered with shiny scales; more dependent on moisture than most lizards; found in tropical regions worldwide | Synonyms: scincid lizard, skink |
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| scintigram | (noun) a recording of the radioactivity emitted by a tracer in an organism or organ system. | - |
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| scintigraph | (noun) The apparatus used to make a scintigram. | Synonyms: scintiscanner |
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| scintilla | (noun) a sparkling glittering particle | - |
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| (noun) a tiny or scarcely detectable amount | Synonyms: iota, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| scintillation | (noun) the quality of shining with a bright reflected light | Synonyms: glisten, glister, glitter, sparkle |
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| (noun) the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight | - |
| (noun) a brilliant display of wit | - |
| (noun) a rapid change in brightness; a brief spark or flash | Synonyms: sparkling, twinkle |
| (noun) (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle | - |
| scintiscanner | (noun) The apparatus used to make a scintigram. | Synonyms: scintigraph |
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| sciolism | (noun) pretentious superficiality of knowledge | - |
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| sciolist | (noun) an amateur who engages in an activity without serious intentions and who pretends to have knowledge | Synonyms: dabbler, dilettante |
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| scion | (noun) a descendant or heir | - |
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| scission | (noun) the act of dividing by cutting or splitting | - |
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| scissors | (noun) a wrestling hold in which you wrap your legs around the opponents body or head and put your feet together and squeeze | Synonyms: scissor grip, scissor hold, scissors grip, scissors hold |
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| (noun) a gymnastic exercise performed on the pommel horse when the gymnast moves his legs as the blades of scissors move | - |
| (noun) an edge tool having two crossed pivoting blades | Synonyms: pair of scissors |
| scissortail | (noun) grey flycatcher of the southwestern United States and Mexico and Central America having a long forked tail and white breast and salmon and scarlet markings | Synonyms: Muscivora-forficata, scissortailed flycatcher |
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| scissure | (noun) a long narrow cleft | Synonyms: cleft, crack, crevice, fissure |
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