| twoscore | (adjective) being ten more than thirty | Synonyms: 40, forty, xl |
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| ultramicroscope | (noun) light microscope that uses scattered light to show particles too small to see with ordinary microscopes | Synonyms: dark-field microscope |
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| ultramicroscopic | (adjective) too small to be seen without an ultramicroscope | - |
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| underscore | (noun) a line drawn underneath (especially under written matter) | Synonyms: underline |
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| (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underline |
| (verb) draw a line or lines underneath to call attention to | Synonyms: underline |
| undiscouraged | (adjective) not deterred | Synonyms: undeterred |
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| undiscoverable | (adjective) not able to be ascertained; resisting discovery | Synonyms: unascertainable |
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| undiscovered | (adjective) not discovered | - |
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| (adjective) not yet discovered | Synonyms: unexplored |
| vaginoscope | (noun) An endoscopic instrument that magnifies the epithelia of the vagina and cervix in vivo to allow direct observation and study of these tissues. | Synonyms: colposcope |
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| viscoelastic | (adjective) having viscous as well as elastic properties | - |
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| viscometer | (noun) a measuring instrument for measuring viscosity | Synonyms: viscosimeter |
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| viscometric | (adjective) of or relating to the measurement of viscosity | Synonyms: viscosimetric |
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| viscometry | (noun) the measurement of viscosity | Synonyms: viscosimetry |
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| viscose | (noun) a rayon fabric made from viscose (cellulose xanthate) fibers | Synonyms: viscose rayon |
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| (noun) a cellulose ester obtained by treating cellulose with caustic soda | Synonyms: cellulose xanthate |
| viscosimeter | (noun) a measuring instrument for measuring viscosity | Synonyms: viscometer |
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| viscosimetric | (adjective) of or relating to the measurement of viscosity | Synonyms: viscometric |
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| viscosimetry | (noun) the measurement of viscosity | Synonyms: viscometry |
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| viscosity | (noun) resistance of a liquid to shear forces (and hence to flow) | Synonyms: viscousness |
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| viscount | (noun) a British peer who ranks below an earl and above a baron | - |
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| (noun) (in various countries) a son or younger brother or a count | - |
| viscountcy | (noun) the title of a viscount | - |
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| (noun) the dignity or rank or position of a viscount or viscountess | Synonyms: viscounty |
| viscountess | (noun) a noblewoman holding the rank of viscount in her own right | - |
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| (noun) a wife or widow of a viscount | - |
| viscounty | (noun) the domain controlled by a viscount or viscountess | - |
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| (noun) the dignity or rank or position of a viscount or viscountess | Synonyms: viscountcy |
| viscous | (adjective) having the sticky properties of an adhesive | Synonyms: gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid |
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| (adjective) having a relatively high resistance to flow | Synonyms: syrupy |
| viscousness | (noun) resistance of a liquid to shear forces (and hence to flow) | Synonyms: viscosity |
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| wainscot | (noun) wooden panels that can be used to line the walls of a room | Synonyms: wainscoting, wainscotting |
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| (noun) panel forming the lower part of an interior wall when it is finished differently from the rest of the wall | Synonyms: dado |
| wainscoted | (adjective) fitted or decorated with panels or wainscoting | Synonyms: paneled, panelled |
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| wainscoting | (noun) wooden panels that can be used to line the walls of a room | Synonyms: wainscot, wainscotting |
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| (noun) a wainscoted wall (or wainscoted walls collectively) | Synonyms: wainscotting |
| wainscotting | (noun) wooden panels that can be used to line the walls of a room | Synonyms: wainscot, wainscoting |
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| (noun) a wainscoted wall (or wainscoted walls collectively) | Synonyms: wainscoting |