| selachian | (noun) any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks, rays, skates | Synonyms: elasmobranch |
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| selection | (noun) the act of choosing or selecting | Synonyms: choice, option, pick |
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| (noun) the person or thing chosen or selected | Synonyms: choice, pick |
| (noun) a passage selected from a larger work | Synonyms: excerpt, excerption, extract |
| (noun) an assortment of things from which a choice can be made | - |
| (noun) a natural process resulting in the evolution of organisms best adapted to the environment | Synonyms: natural selection, survival, survival of the fittest |
| selectivity | (noun) the property of being selective | - |
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| selectman | (noun) a male elected member of a board of officials who run New England towns | - |
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| selector | (noun) a switch that is used to select among alternatives | Synonyms: selector switch |
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| (noun) a person who chooses or selects out | Synonyms: chooser, picker |
| selectwoman | (noun) a female elected member of a board of officials who run New England towns | - |
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| selenator | (noun) A fan of Selena Gomez | - |
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| selenite | (noun) a compound that contains a SeO32− anion. | - |
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| selenium | (noun) a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) | Synonyms: atomic number 34, Se |
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| selenolatry | (noun) the worship of the moon | Synonyms: moon-worship |
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| selenology | (noun) the branch of astronomy that deals with the moon | - |
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| self | (noun) your consciousness of your own identity | Synonyms: ego |
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| (noun) a person considered as a unique individual | - |
| selfishness | (noun) stinginess resulting from a concern for your own welfare and a disregard of others | - |
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| selflessness | (noun) acting with less concern for yourself than for the success of the joint activity | Synonyms: self-sacrifice |
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| (noun) the quality of unselfish concern for the welfare of others | Synonyms: altruism |
| selfsameness | (noun) the quality of being identical with itself | - |
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| sell | (noun) the activity of persuading someone to buy | - |
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| seller | (noun) someone who promotes or exchanges goods or services for money | Synonyms: marketer, trafficker, vender, vendor |
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| selling | (noun) the exchange of goods for an agreed sum of money | Synonyms: marketing, merchandising |
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| selloff | (noun) a sale of a relatively large number of assets (stocks or bonds or commodities) at a low price typically done to dispose of them rather than as normal trade | - |
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| sellout | (noun) a betrayal of one's principles principles, country, cause, etc. | - |
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| (noun) the selling of an entire stock of something | - |
| (noun) an event for which all tickets are sold | - |
| (noun) someone who has sold out | - |
| selsyn | (noun) a system consisting of a generator and a motor so connected that the motor will assume the same relative position as the generator; the generator and the motor are synchronized | Synonyms: synchro |
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| seltzer | (noun) naturally effervescent mineral water | - |
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| (noun) effervescent beverage artificially charged with carbon dioxide | Synonyms: carbonated water, club soda, soda water, sparkling water |
| selva | (noun) a rain forest in a tropical area | Synonyms: tropical rain forest |
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| selvage | (noun) the edge of a fabric that is woven so that it will not ravel or fray | Synonyms: selvedge |
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| (noun) border consisting of an ornamental fringe at either end of an oriental carpet | Synonyms: selvedge |
| selvedge | (noun) the edge of a fabric that is woven so that it will not ravel or fray | Synonyms: selvage |
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| (noun) border consisting of an ornamental fringe at either end of an oriental carpet | Synonyms: selvage |