| bilirubin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: haematoidin, hematoidin |
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| cherub | (noun) an angel of the second order whose gift is knowledge; usually portrayed as a winged child | - |
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| (noun) a sweet innocent baby | - |
| doxorubicin | (noun) an antibiotic used as an anticancer drug | - |
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| drubbing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, lacing, licking, thrashing, trouncing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, slaughter, thrashing, trouncing, walloping, whipping |
| grub | (noun) a soft thick wormlike larva of certain beetles and other insects | - |
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| (noun) informal terms for a meal | Synonyms: chow, chuck, eats |
| grubbiness | (noun) the state of being grimy | Synonyms: griminess |
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| grubby | (noun) small sculpin of the coast of New England | Synonyms: Myxocephalus aenaeus |
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| grubstake | (noun) funds advanced to a prospector or to someone starting a business in return for a share of the profits | - |
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| hyperbilirubinemia | (noun) abnormally high amounts of bile pigment (bilirubin) in the blood | - |
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| krubi | (noun) malodorous tropical plant having a spathe that resembles the corolla of a morning glory and attains a diameter of several feet | Synonyms: Amorphophallus titanum, titan arum |
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| moneygrubber | (noun) someone whose main interest in life is moneymaking | - |
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| pseudorubella | (noun) a viral disease of infants and young children; characterized by abrupt high fever and mild sore throat; a few days later there is a faint pinkish rash that lasts for a few hours to a few days | Synonyms: exanthema subitum, roseola infantilis, roseola infantum |
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| rub | (noun) the act of rubbing or wiping | Synonyms: wipe |
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| (noun) an unforeseen obstacle | Synonyms: hang-up, hitch, snag |
| rubato | (noun) a flexible tempo; not strictly on the beat | - |
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| rubber | (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: arctic, galosh, golosh, gumshoe |
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| (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 |
| 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 |
| rubbernecker | (noun) a person who stares inquisitively | Synonyms: rubberneck |
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| 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 |
| 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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| 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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| 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 |
| ruby | (noun) a deep and vivid red color | Synonyms: crimson, deep red |
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| (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 | - |
| scrub | (noun) the act of cleaning a surface by rubbing it with a brush and soap and water | Synonyms: scouring, scrubbing |
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| (noun) dense vegetation consisting of stunted trees or bushes | Synonyms: bush, chaparral |
| scrubber | (noun) a purifier that removes impurities from a gas | - |
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| (noun) a brush with short stiff bristles for heavy cleaning | Synonyms: scrub brush, scrubbing brush |
| (noun) a worker who uses a scrub brush to clean a surface (usually a floor or deck) | - |
| scrubbiness | (noun) the property of being stunted and inferior in size or quality | Synonyms: scrawniness |
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| scrubbing | (noun) the act of cleaning a surface by rubbing it with a brush and soap and water | Synonyms: scouring, scrub |
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| scrubbird | (noun) small fast-running Australian bird resembling a wren and frequenting brush or scrub | Synonyms: scrub-bird, scrub bird |
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| scrubland | (noun) an uncultivated region covered with scrub vegetation | - |
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| scrubs | (noun) protective garment worn by surgeons during operations | Synonyms: gown, surgical gown |
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| shrub | (noun) a low woody perennial plant usually having several major stems | Synonyms: bush |
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| shrubbery | (noun) a collection of shrubs growing together | - |
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| (noun) an area where a number of shrubs are planted | - |
| shrublet | (noun) dwarf shrub | - |
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| subshrub | (noun) low-growing woody shrub or perennial with woody base | Synonyms: suffrutex |
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| undershrub | (noun) a low shrub | - |
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