| rattail | (noun) deep-sea fish with a large head and body and long tapering tail | Synonyms: grenadier, rattail fish |
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| rattan | (noun) a switch made from the stems of the rattan palms | Synonyms: ratan |
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| (noun) climbing palm of Sri Lanka and southern India remarkable for the great length of the stems which are used for malacca canes | Synonyms: Calamus rotang, rattan palm |
| (noun) the stem of various climbing palms of the genus Calamus and related genera used to make wickerwork and furniture and canes | Synonyms: rattan cane |
| ratter | (noun) any of several breeds of terrier developed to catch rats | Synonyms: rat terrier |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: apostate, deserter, recreant, renegade, turncoat |
| ratting | (noun) to furnish incriminating evidence to an officer of the law (usually in return for favors) | Synonyms: informing |
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| rattle | (noun) loosely connected horny sections at the end of a rattlesnake's tail | - |
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| (noun) a baby's toy that makes percussive noises when shaken | - |
| (noun) a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders) | Synonyms: rale, rattling |
| rattlebox | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: crotalaria |
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| rattler | (noun) pit viper with horny segments at the end of the tail that rattle when shaken | Synonyms: rattlesnake |
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| (noun) a railroad train consisting of freight cars | Synonyms: freight train |
| rattlesnake | (noun) pit viper with horny segments at the end of the tail that rattle when shaken | Synonyms: rattler |
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| rattling | (noun) a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders) | Synonyms: rale, rattle |
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| rattrap | (noun) a trap for catching rats | - |
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| (noun) filthy run-down dilapidated housing | - |
| (noun) a difficult entangling situation | - |