| oriflamme | (noun) a red or orange-red flag used as a standard by early French kings | - |
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| (noun) an inspiring symbol or ideal that serves as a rallying point in a struggle | - |
| rifle | (noun) a shoulder firearm with a long barrel and a rifled bore | - |
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| riflebird | (noun) velvety black Australian bird of paradise with green and purple iridescence on head and tail | Synonyms: Ptloris paradisea |
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| rifleman | (noun) a soldier whose weapon is a rifle | - |
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| (noun) someone skilled in the use of a rifle | - |
| rifling | (noun) the cutting of spiral grooves on the inside of the barrel of a firearm | Synonyms: grooving |
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| trifle | (noun) something of small importance | Synonyms: small beer, trivia, triviality |
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| (noun) a detail that is considered insignificant | Synonyms: triviality |
| (noun) a cold pudding made of layers of sponge cake spread with fruit or jelly; may be decorated with nuts, cream, or chocolate | - |
| trifler | (noun) one who behaves lightly or not seriously | - |
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| trifling | (noun) the deliberate act of delaying and playing instead of working | Synonyms: dalliance, dawdling |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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