| redbelly | (noun) freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell | Synonyms: Pseudemys rubriventris, red-bellied terrapin, red-bellied turtle |
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| redberry | (noun) small spiny evergreen shrub of western United States and Mexico with minute flowers and bright red berries | Synonyms: red-berry, Rhamnus croceus |
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| (noun) North American perennial herb with alternately compound leaves and racemes of small white flowers followed by bright red oval poisonous berries | Synonyms: Actaea rubra, red-berry, red baneberry, snakeberry |
| redbird | (noun) crested thick-billed North American finch having bright red plumage in the male | Synonyms: cardinal, cardinal grosbeak, Cardinalis cardinalis, Richmondena Cardinalis |
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| (noun) the male is bright red with black wings and tail | Synonyms: firebird, Piranga olivacea, scarlet tanager |
| redbone | (noun) a speedy red or red-and-tan American hound | - |
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| redbreast | (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, robin, robin redbreast |
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| redbrick | (adjective) of or relating to British universities founded in the late 19th century or the 20th century | Synonyms: red-brick |
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| redbrush | (noun) common North American shrub with reddish purple twigs and white flowers | Synonyms: American dogwood, Cornus stolonifera, red dogwood, red osier, red osier dogwood |
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| redbud | (noun) small shrubby tree of eastern North America similar to the Judas tree having usually pink flowers; found in damp sheltered underwood | Synonyms: Cercis canadensis |
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| redbug | (noun) larval mite that sucks the blood of vertebrates including human beings causing intense irritation | Synonyms: chigger, harvest mite, jigger |
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