| chondrule | (noun) small granule (of e.g. chrysolite) found in some meteoric rocks | - |
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| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| dandruff | (noun) loose scales shed from the scalp | - |
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| (noun) a condition in which white scales of dead skin are shed by the scalp | - |
| doldrums | (noun) a belt of calms and light winds between the northern and southern trade winds of the Atlantic and Pacific | - |
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| (noun) a state of inactivity (in business or art etc) | Synonyms: stagnancy, stagnation |
| 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 |
| drudge | (noun) a laborer who is obliged to do menial work | Synonyms: galley slave, navvy, peon |
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| (noun) one who works hard at boring tasks | Synonyms: hack, hacker |
| drudgery | (noun) hard monotonous routine work | Synonyms: donkeywork, grind, plodding |
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| drug | (noun) a substance that is used as a medicine or narcotic | - |
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| drugget | (noun) a rug made of a coarse fabric having a cotton warp and a wool filling | - |
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| drugging | (noun) the administration of a sedative agent or drug | Synonyms: sedation |
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| druggist | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: apothecary, chemist, pharmacist, pill pusher, pill roller |
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| drugstore | (noun) a retail shop where medicine and other articles are sold | Synonyms: apothecary's shop, chemist's, chemist's shop, pharmacy |
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| druidism | (noun) the system of religion and philosophy taught by the Druids and their rites and ceremonies | - |
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| drum | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drumfish |
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| (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: membranophone, tympan |
| (noun) a cylindrical metal container, commonly used for shipping or storage of liquids | Synonyms: metal drum |
| (noun) a hollow cast iron cylinder attached to the wheel that forms part of the brakes | Synonyms: brake drum |
| (noun) the sound of a drum | - |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: barrel |
| drumbeat | (noun) a vehement and vociferous advocacy of a cause | - |
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| (noun) (military) the beating of a drum as a signal for lowering the flag at sundown | - |
| (noun) the sound made by beating a drum | Synonyms: rataplan, rub-a-dub |
| drumbeater | (noun) a fervent and even militant proponent of something | Synonyms: partisan, zealot |
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| drumfire | (noun) intense and continuous artillery fire | Synonyms: cannonade |
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| drumfish | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drum |
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| drumhead | (noun) a membrane that is stretched taut over a drum | Synonyms: head |
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| drumlin | (noun) a mound of glacial drift | - |
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| drummer | (noun) someone who plays a drum | - |
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| drumming | (noun) the act of playing drums | - |
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| drumstick | (noun) a stick used for playing a drum | - |
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| (noun) the lower joint of the leg of a fowl | - |
| drunk | (noun) a chronic drinker | Synonyms: drunkard, inebriate, rummy, sot, wino |
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| (noun) someone who is intoxicated | - |
| drunkard | (noun) a chronic drinker | Synonyms: drunk, inebriate, rummy, sot, wino |
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| drunkenness | (noun) the act of drinking alcoholic beverages to excess | Synonyms: boozing, crapulence, drink, drinking |
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| (noun) a temporary state resulting from excessive consumption of alcohol | Synonyms: inebriation, inebriety, insobriety, intoxication, tipsiness |
| (noun) habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms | Synonyms: alcohol addiction, alcoholism, inebriation |
| drupe | (noun) fleshy indehiscent fruit with a single seed: e.g. almond, peach, plum, cherry, elderberry, olive, jujube | Synonyms: stone fruit |
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| drupelet | (noun) a small part of an aggregate fruit that resembles a drupe | - |
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| drusen | (noun) (plural) an eye disease resulting from small accumulations of hyaline bodies underneath the retina | - |
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| druthers | (noun) the right or chance to choose | Synonyms: preference |
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| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| humdrum | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
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| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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| quadrumvirate | (noun) a group of four men | - |
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| quadruped | (noun) an animal especially a mammal having four limbs specialized for walking | - |
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| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quadruplicate | (noun) any four copies; any of four things that correspond to one another exactly | - |
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| quadrupling | (noun) increase by a factor of four | - |
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| roadrunner | (noun) speedy largely terrestrial bird found from California and Mexico to Texas | Synonyms: chaparral cock, Geococcyx californianus |
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| woodruff | (noun) any plant of the genus Asperula | - |
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| (noun) Old World fragrant stoloniferous perennial having small white flowers and narrow leaves used as flavoring and in sachets; widely cultivated as a ground cover; in some classifications placed in genus Asperula | Synonyms: Asperula odorata, fragrant bedstraw, Galium odoratum, sweet woodruff, waldmeister |