| rub | (noun) the act of rubbing or wiping | Synonyms: wipe |
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| (noun) an unforeseen obstacle | Synonyms: hang-up, hitch, snag |
| (verb) move over something with pressure | - |
| (verb) cause friction | Synonyms: chafe, fray, fret, scratch |
| (verb) scrape or rub as if to relieve itching | Synonyms: itch, scratch |
| rubato | (noun) a flexible tempo; not strictly on the beat | - |
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| rubber | (adjective) returned for lack of funds | Synonyms: no-good |
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| (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: arctic, galosh, golosh, gumshoe |
| (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: condom, prophylactic, safe, safety |
| (noun) an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil | Synonyms: pencil eraser, rubber eraser |
| (noun) a contest consisting of a series of successive matches between the same sides | - |
| (noun) an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products | Synonyms: caoutchouc, gum elastic, India rubber, natural rubber |
| (noun) any of various synthetic elastic materials whose properties resemble natural rubber | Synonyms: synthetic rubber |
| (verb) coat or impregnate with rubber | Synonyms: rubberise, rubberize |
| rubberise | (verb) coat or impregnate with rubber | Synonyms: rubber, rubberize |
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| rubberize | (verb) coat or impregnate with rubber | Synonyms: rubber, rubberise |
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| rubberlike | (adjective) having an elastic texture resembling rubber in flexibility or toughness | Synonyms: rubbery |
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| rubberneck | (noun) a person who stares inquisitively | Synonyms: rubbernecker |
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| (noun) a tourist who is visiting sights of interest | Synonyms: excursionist, sightseer, tripper |
| (verb) strain to watch; stare curiously | - |
| rubbernecker | (noun) a person who stares inquisitively | Synonyms: rubberneck |
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| rubberstamp | (verb) approve automatically | - |
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| (verb) stamp with a rubber stamp, usually an indication of official approval on a document | Synonyms: handstamp |
| rubbery | (adjective) having an elastic texture resembling rubber in flexibility or toughness | Synonyms: rubberlike |
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| (adjective) difficult to chew | Synonyms: cartilaginous, gristly |
| rubbing | (noun) effort expended in moving one object over another with pressure | Synonyms: detrition, friction |
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| (noun) representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal | - |
| (noun) the resistance encountered when one body is moved in contact with another | Synonyms: friction |
| rubbish | (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, folderol, trash, tripe, trumpery, wish-wash |
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| (noun) worthless material that is to be disposed of | Synonyms: scrap, trash |
| (verb) attack strongly | - |
| rubbishy | (adjective) cheap and inferior; of no value | Synonyms: trashy |
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| rubble | (noun) the remains of something that has been destroyed or broken up | Synonyms: debris, detritus, dust, junk |
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| rubdown | (noun) the act of rubbing down, usually for relaxation or medicinal purposes | - |
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| rube | (noun) a person who is not very intelligent or interested in culture | Synonyms: bumpkin, chawbacon, hayseed, hick, yahoo, yokel |
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| rubefacient | (noun) a medicine for external application that produces redness of the skin | - |
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| rubel | (noun) the basic unit of money in Belarus | - |
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| rubella | (noun) a contagious viral disease that is a milder form of measles lasting three or four days; can be damaging to a fetus during the first trimester | Synonyms: epidemic roseola, German measles, three-day measles |
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| rubeola | (noun) an acute and highly contagious viral disease marked by distinct red spots followed by a rash; occurs primarily in children | Synonyms: measles, morbilli |
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| rubicelle | (noun) a yellow or orange variety of ruby spinel | - |
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| rubicund | (adjective) inclined to a healthy reddish color often associated with outdoor life | Synonyms: florid, ruddy, sanguine |
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| rubidium | (noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite | Synonyms: atomic number 37, Rb |
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| rubify | (verb) make ruby red | - |
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| ruble | (noun) the basic unit of money in Russia | Synonyms: rouble |
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| (noun) the basic unit of money in Tajikistan | - |
| rubor | (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: inflammation, redness |
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| rubric | (noun) category name | - |
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| (noun) a title or heading that is printed in red or in a special type | - |
| (noun) an explanation or definition of an obscure word in a text | Synonyms: gloss |
| (noun) an authoritative rule of conduct or procedure | - |
| (noun) directions for the conduct of Christian church services (often printed in red in a prayer book) | - |
| (noun) a heading that names a statute or legislative bill; may give a brief summary of the matters it deals with | Synonyms: statute title, title |
| (verb) adorn with ruby red color | - |
| rubricate | (verb) sign with a mark instead of a name | - |
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| (verb) decorate (manuscripts) with letters painted red | Synonyms: miniate |
| (verb) furnish with rubrics or regulate by rubrics | - |
| (verb) place in the church calendar as a red-letter day honoring a saint | - |
| ruby | (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, ruddy, scarlet |
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| (noun) a deep and vivid red color | Synonyms: crimson, deep red |
| (noun) a transparent piece of ruby that has been cut and polished and is valued as a precious gem | - |
| (noun) a transparent deep red variety of corundum; used as a gemstone and in lasers | - |