| 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 |
| rudderless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, undirected |
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| 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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| (verb) redden as if with a red ocher color | - |
| (verb) twist or braid together, interlace | Synonyms: raddle |
| ruddles | (noun) the common European annual marigold | Synonyms: Calendula officinalis, common marigold, pot marigold, Scotch marigold |
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| ruddy | (adjective) of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies | Synonyms: blood-red, carmine, cerise, cherry-red, cherry, crimson, red, reddish, ruby-red, ruby, scarlet |
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| (adjective) inclined to a healthy reddish color often associated with outdoor life | Synonyms: florid, rubicund, sanguine |
| rude | (adjective) lacking civility or good manners | Synonyms: uncivil |
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| (adjective) belonging to an early stage of technical development; characterized by simplicity and (often) crudeness | Synonyms: crude, primitive |
| (adjective) socially incorrect in behavior | Synonyms: bad-mannered, ill-mannered, unmannered, unmannerly |
| (adjective) (used especially of commodities) being unprocessed or manufactured using only simple or minimal processes | Synonyms: natural, raw |
| (adjective) (of persons) lacking in refinement or grace | Synonyms: bounderish, ill-bred, lowbred, underbred, yokelish |
| rudely | (adverb) in an impolite manner | Synonyms: discourteously, impolitely |
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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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| rudimentary | (adjective) being or involving basic facts or principles | Synonyms: fundamental, underlying |
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| (adjective) being in the earliest stages of development | - |
| (adjective) not fully developed in mature animals | Synonyms: vestigial |
| 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 |