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| UPON | | prep. = *on. [from up on] | |
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| URDU | | n. Language related to hindi but with many persian words, used esp. In pakistan. [hindustani] | |
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| UREA | | n. Soluble nitrogenous compound contained esp. In urine. [french uree from greek ouron urine] | |
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| URGE | | —v. (-ging) 1 (often foll. By on) drive forcibly; hasten.
- encourage or entreat earnestly or persistently.
- (often foll. By on, upon) advocate (an action or argument etc.) Emphatically (to a person). —n. - urging impulse or tendency.
- strong desire. [latin urgeo] | |
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| URIC | | acid n. Constituent of urine.
- adj. Of urine. [french urique: related to *urine] | |
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| URSA | | major n. = great bear (see *bear2). [latin]
- minor n. = little bear (see *bear2). [latin] | |
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| USAF | | abbr. United states air force. | |
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| USER | | n. Person who uses a thing. | |
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| USSR | | abbr. Hist. Union of soviet socialist republics. | |
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| UVPC | | abbr. Unplasticized polyvinyl chloride. | |
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