| rudapithecus | (noun) fossil hominoids from northern central Hungary; late Miocene | Synonyms: Dryopithecus Rudapithecus hungaricus |
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| rudd | (noun) European freshwater fish resembling the roach | Synonyms: Scardinius erythrophthalmus |
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| rudder | (noun) (nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel | - |
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| (noun) a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes | - |
| rudderfish | (noun) fish having the habit of following ships; found in North American and South American coastal waters | Synonyms: banded rudderfish, Seriola zonata |
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| (noun) food and game fish around Bermuda and Florida; often follow ships | Synonyms: Bermuda chub, Kyphosus sectatrix |
| rudderpost | (noun) a vertical post at the forward edge of a rudder that enables the rudder to pivot | Synonyms: rudderstock |
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| rudderstock | (noun) a vertical post at the forward edge of a rudder that enables the rudder to pivot | Synonyms: rudderpost |
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| ruddiness | (noun) a healthy reddish complexion | Synonyms: rosiness |
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| ruddle | (noun) a red iron ore used in dyeing and marking | Synonyms: raddle, reddle |
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| ruddles | (noun) the common European annual marigold | Synonyms: Calendula officinalis, common marigold, pot marigold, Scotch marigold |
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| rudeness | (noun) a manner that is rude and insulting | Synonyms: discourtesy |
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| (noun) a wild or unrefined state | Synonyms: crudeness, crudity, primitiveness, primitivism |
| rudiment | (noun) the remains of a body part that was functional at an earlier stage of life | - |
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| rudiments | (noun) the elementary stages of any subject (usually plural) | Synonyms: alphabet, first principles |
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| (noun) a statement of fundamental facts or principles | Synonyms: basics |