| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
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| vector | (noun) (genetics) a virus or other agent that is used to deliver DNA to a cell | - |
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| (noun) a variable quantity that can be resolved into components | - |
| (noun) any agent (person or animal or microorganism) that carries and transmits a disease | Synonyms: transmitter |
| (noun) a straight line segment whose length is magnitude and whose orientation in space is direction | - |
| velociraptor | (noun) small active carnivore that probably fed on protoceratops; possibly related more closely to birds than to other dinosaurs | - |
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| vendor | (noun) someone who promotes or exchanges goods or services for money | Synonyms: marketer, seller, trafficker, vender |
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| venerator | (noun) someone who regards with deep respect or reverence | - |
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| ventilator | (noun) a device (such as a fan) that introduces fresh air or expels foul air | - |
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| (noun) a device that facilitates breathing in cases of respiratory failure | Synonyms: breathing apparatus, breathing device, breathing machine |
| vibrator | (noun) mechanical device that produces vibratory motion; used for massage | - |
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| (noun) a mechanical device that vibrates | - |
| victor | (noun) the contestant who wins the contest | Synonyms: winner |
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| (noun) a combatant who is able to defeat rivals | Synonyms: master, superior |
| vigor | (noun) active strength of body or mind | Synonyms: dynamism, heartiness, vigour |
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| (noun) an imaginative lively style (especially style of writing) | Synonyms: energy, muscularity, vigour, vim |
| (noun) forceful exertion | Synonyms: energy, vigour, zip |
| vindicator | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, justifier |
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| violator | (noun) someone who assaults others sexually | Synonyms: debaucher, ravisher |
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| (noun) someone who violates the law | Synonyms: law offender, lawbreaker |
| visitor | (noun) someone who visits | Synonyms: visitant |
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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 |
| vizor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, visor |
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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: visor |
| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
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| warrantor | (noun) one who provides a warrant or guarantee to another | Synonyms: guarantor, surety, warranter |
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| warrior | (noun) someone engaged in or experienced in warfare | - |
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| watercolor | (noun) the art or technique of painting with watercolors | Synonyms: water-color, water-colour, watercolour |
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| (noun) a painting produced with watercolors | Synonyms: water-color, water-colour, watercolour |
| (noun) a water-base paint (with water-soluble pigments); used by artists | Synonyms: water-color, water-colour, watercolour |
| (noun) water-soluble pigment | Synonyms: water-color, water-colour, watercolour |