| sorrel | (noun) a horse of a brownish orange to light brown color | - |
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| (noun) large sour-tasting arrowhead-shaped leaves used in salads and sauces | Synonyms: common sorrel |
| (noun) any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine | Synonyms: dock, sour grass |
| (noun) any plant or flower of the genus Oxalis | Synonyms: oxalis, wood sorrel |
| (noun) East Indian sparsely prickly annual herb or perennial subshrub widely cultivated for its fleshy calyxes used in tarts and jelly and for its bast fiber | Synonyms: Hibiscus sabdariffa, Jamaica sorrel, red sorrel, roselle, rozelle |
| sorriness | (noun) worthlessness due to insignificance | Synonyms: paltriness |
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| sorrow | (noun) something that causes great unhappiness | Synonyms: grief |
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| (noun) an emotion of great sadness associated with loss or bereavement | - |
| (noun) sadness associated with some wrong done or some disappointment | Synonyms: regret, rue, ruefulness |
| (noun) the state of being sad | Synonyms: sadness, sorrowfulness |
| sorrower | (noun) a person who is feeling grief (as grieving over someone who has died) | Synonyms: griever, lamenter, mourner |
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| sorrowfulness | (noun) a state of gloomy sorrow | Synonyms: mournfulness, ruthfulness |
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| (noun) the state of being sad | Synonyms: sadness, sorrow |
| sort | (noun) an approximate definition or example | - |
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| (noun) a category of things distinguished by some common characteristic or quality | Synonyms: form, kind, variety |
| (noun) a person of a particular character or nature | - |
| (noun) an operation that segregates items into groups according to a specified criterion | Synonyms: sorting |
| sorter | (noun) a machine for sorting things (such as punched cards or letters) into classes | - |
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| (noun) a clerk who sorts things (as letters at the post office) | - |
| sortie | (noun) a military action in which besieged troops burst forth from their position | Synonyms: sally |
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| (noun) (military) an operational flight by a single aircraft (as in a military operation) | - |
| sorting | (noun) grouping by class or kind or size | - |
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| (noun) the basic cognitive process of arranging into classes or categories | Synonyms: categorisation, categorization, classification |
| (noun) an operation that segregates items into groups according to a specified criterion | Synonyms: sort |
| sortition | (noun) making a chance decision by using lots (straws or pebbles etc.) that are thrown or drawn | Synonyms: casting lots, drawing lots |
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| sorus | (noun) cluster of sporangia usually on underside of a fern frond | - |
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| (noun) a spore-producing structure in certain lichens and fungi | - |
| sponsor | (noun) someone who supports or champions something | Synonyms: patron, supporter |
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| (noun) an advocate who presents a person (as for an award or a degree or an introduction etc.) | Synonyms: presenter |
| sponsorship | (noun) the act of sponsoring (either officially or financially) | - |
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| stressor | (noun) any agent that causes stress to an organism | - |
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| successor | (noun) a thing or person that immediately replaces something or someone | - |
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| (noun) a person who inherits some title or office | Synonyms: heir |
| (noun) a person who follows next in order | Synonyms: replacement |
| supervisor | (noun) a program that controls the execution of other programs | Synonyms: executive program, supervisory program |
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| (noun) one who supervises or has charge and direction of | - |
| suppressor | (noun) an electrical device for suppressing unwanted currents | Synonyms: suppresser |
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| (noun) a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene) | Synonyms: suppresser, suppresser gene, suppressor gene |
| (noun) someone who suppresses | Synonyms: suppresser |
| suspensor | (noun) a support for the genitals worn by men engaging in strenuous exercise | Synonyms: athletic supporter, jock, jockstrap, supporter |
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| suspensory | (noun) a bandage of elastic fabric applied to uplift a dependant part (as the scrotum or a pendulous breast) | Synonyms: suspensory bandage |
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| tensor | (noun) any of several muscles that cause an attached structure to become tense or firm | - |
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| (noun) a generalization of the concept of a vector | - |
| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| tortfeasor | (noun) a party who has committed a tort | Synonyms: tort-feasor |
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| transgressor | (noun) someone who transgresses; someone who violates a law or command | - |
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| tsoris | (noun) (Yiddish) trouble and suffering | - |
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| tussore | (noun) oriental moth that produces brownish silk | Synonyms: Antheraea mylitta, tussah, tusseh, tusser, tussur |
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| vasopressor | (noun) any agent that produces vasoconstriction and a rise in blood pressure (usually understood as increased arterial pressure) | - |
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| visor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, vizor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: vizor |
| woolsorter | (noun) a person who sorts wool into different grades | Synonyms: wool stapler |
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