| tutor | (noun) a person who gives private instruction (as in singing, acting, etc.) | Synonyms: coach, private instructor |
|---|
| (verb) be a tutor to someone; give individual instruction | - |
| (verb) act as a guardian to someone | - |
| urinator | (noun) a person who urinates | Synonyms: pisser |
|---|
| utahraptor | (noun) large (20-ft) and swift carnivorous dinosaur having an upright slashing claw 15 inches long on each hind foot; early Cretaceous | Synonyms: superslasher |
|---|
| vaccinator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: inoculator |
|---|
| vacillator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, hesitator, waverer |
|---|
| valuator | (noun) one who estimates officially the worth or value or quality of things | Synonyms: appraiser |
|---|
| vasoconstrictor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictive |
|---|
| vasodilator | (noun) a drug that causes dilation of blood vessels | Synonyms: vasodilative |
|---|
| vasomotor | (adjective) relating to the nerves and muscles that cause the blood vessels to constrict or dilate | - |
|---|
| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
|---|
| vector | (noun) (genetics) a virus or other agent that is used to deliver DNA to a cell | - |
|---|
| (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 | - |
|---|
| venerator | (noun) someone who regards with deep respect or reverence | - |
|---|
| ventilator | (noun) a device (such as a fan) that introduces fresh air or expels foul air | - |
|---|
| (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 | - |
|---|
| (noun) a mechanical device that vibrates | - |
| victor | (noun) the contestant who wins the contest | Synonyms: winner |
|---|
| (noun) a combatant who is able to defeat rivals | Synonyms: master, superior |
| vindicator | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, justifier |
|---|
| violator | (noun) someone who assaults others sexually | Synonyms: debaucher, ravisher |
|---|
| (noun) someone who violates the law | Synonyms: law offender, lawbreaker |
| visitor | (noun) someone who visits | Synonyms: visitant |
|---|
| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
|---|
| warrantor | (noun) one who provides a warrant or guarantee to another | Synonyms: guarantor, surety, warranter |
|---|