| alarum | (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alert, warning signal |
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| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| arum | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: aroid |
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| (noun) starch resembling sago that is obtained from cuckoopint root | - |
| breadcrumb | (noun) crumb of bread; used especially for coating or thickening | - |
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| candelabrum | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabra |
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| centrum | (noun) the main body of a vertebra | - |
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| cerebrum | (noun) anterior portion of the brain consisting of two hemispheres; dominant part of the brain in humans | - |
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| cerumen | (noun) a soft yellow wax secreted by glands in the ear canal | Synonyms: earwax |
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| chetrum | (noun) 100 chetrums equal 1 ngultrum in Bhutan | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| crumb | (noun) small piece of e.g. bread or cake | - |
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| (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, dirty dog, git, lowlife, puke, rat, rotter, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
| (noun) a very small quantity of something | - |
| crumbliness | (noun) excessive breakableness | Synonyms: friability |
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| crumhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, krummhorn |
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| crumpet | (noun) a thick soft cake with a porous texture; cooked on a griddle | - |
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| decorum | (noun) propriety in manners and conduct | Synonyms: decorousness |
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| diestrum | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrus |
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| 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 |
| 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 | - |
| durum | (noun) wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America | Synonyms: durum wheat, hard wheat, macaroni wheat, Triticum durum, Triticum turgidum |
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| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| electrum | (noun) an alloy of gold and silver | - |
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| forum | (noun) a public facility to meet for open discussion | Synonyms: assembly, meeting place |
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| (noun) a public meeting or assembly for open discussion | - |
| frumenty | (noun) sweet spiced porridge made from hulled wheat | - |
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| frump | (noun) a dull unattractive unpleasant girl or woman | Synonyms: dog |
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| fulcrum | (noun) the pivot about which a lever turns | - |
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| grumble | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumbling, murmur, murmuring, mutter, muttering |
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| (noun) a loud low dull continuous noise | Synonyms: grumbling, rumble, rumbling |
| grumbler | (noun) a person given to excessive complaints and crying and whining | Synonyms: bellyacher, complainer, crybaby, moaner, sniveller, squawker, whiner |
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| grumbling | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, murmur, murmuring, mutter, muttering |
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| (noun) a loud low dull continuous noise | Synonyms: grumble, rumble, rumbling |
| grume | (noun) a semisolid mass of coagulated red and white blood cells | Synonyms: blood clot |
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| (noun) a thick viscous liquid | - |
| grummet | (noun) fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines | Synonyms: cringle, eyelet, grommet, loop |
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| grump | (noun) a bad-tempered person | Synonyms: churl, crank, crosspatch, grouch |
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| grumpiness | (noun) a fussy and eccentric disposition | Synonyms: contrariness, crankiness, crotchetiness |
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| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| humdrum | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
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| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| indecorum | (noun) an act of undue intimacy | Synonyms: familiarity, impropriety, liberty |
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| (noun) a lack of decorum | Synonyms: indecorousness |
| instrument | (noun) the means whereby some act is accomplished | Synonyms: tool |
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| (noun) a device that requires skill for proper use | - |
| (noun) any of various devices or contrivances that can be used to produce musical tones or sounds | Synonyms: musical instrument |
| (noun) (law) a document that states some contractual relationship or grants some right | Synonyms: legal document, legal instrument, official document |
| (noun) the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process | Synonyms: instrumental role |
| (noun) a person used by another to gain an end | Synonyms: cat's-paw, pawn |
| instrumentalism | (noun) a system of pragmatic philosophy that considers idea to be instruments that should guide our actions and their value is measured by their success | - |
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| instrumentalist | (noun) someone who plays a music as a profession | Synonyms: musician, player |
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| instrumentality | (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentation, means |
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| (noun) the quality of being instrumental for some purpose | - |
| (noun) a subsidiary organ of government created for a special purpose | - |
| instrumentation | (noun) the act of providing or using the instruments needed for some implementation | - |
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| (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: orchestration |
| (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentality, means |
| (noun) the instruments called for in a musical score or arrangement for a band or orchestra | - |
| jorum | (noun) a large drinking bowl | - |
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| (noun) the quantity that a jorum will hold. | - |
| 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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| krummhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, crumhorn |
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| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| marum | (noun) Mediterranean germander having small hairy leaves and reddish purple flowers; attractive to cats | Synonyms: cat thyme, Teucrium marum |
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| marumi | (noun) shrub bearing round-fruited kumquats | Synonyms: Fortunella japonica, marumi kumquat, round kumquat |
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| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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| plectrum | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectron |
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| pyrethrum | (noun) spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum coccineum, painted daisy, Tanacetum coccineum |
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| (noun) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium |
| (noun) made of dried flower heads of pyrethrum plants | - |
| quadrumvirate | (noun) a group of four men | - |
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| quorum | (noun) a gathering of the minimal number of members of an organization to conduct business | - |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| rum | (noun) a card game based on collecting sets and sequences; the winner is the first to meld all their cards | Synonyms: rummy |
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| (noun) liquor distilled from fermented molasses | - |
| rumba | (noun) a folk dance in duple time that originated in Cuba with Spanish and African elements; features complex footwork and violent movement | Synonyms: rhumba |
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| (noun) a ballroom dance based on the Cuban folk dance | Synonyms: rhumba |
| (noun) syncopated music in duple time for dancing the rumba | Synonyms: rhumba |
| rumble | (noun) a fight between rival gangs of adolescents | Synonyms: gang fight |
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| (noun) a servant's seat (or luggage compartment) in the rear of a carriage | - |
| (noun) a loud low dull continuous noise | Synonyms: grumble, grumbling, rumbling |
| rumbling | (noun) a loud low dull continuous noise | Synonyms: grumble, grumbling, rumble |
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| rumen | (noun) the first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing | Synonyms: first stomach |
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| ruminant | (noun) any of various cud-chewing hoofed mammals having a stomach divided into four (occasionally three) compartments | - |
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| rumination | (noun) regurgitation of small amounts of food; seen in some infants after feeding | - |
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| (noun) (of ruminants) chewing (the cud) | - |
| (noun) a calm, lengthy, intent consideration | Synonyms: contemplation, musing, reflection, reflexion, thoughtfulness |
| ruminator | (noun) a reflective thinker characterized by quiet contemplation | Synonyms: muller, muser, ponderer |
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| rummage | (noun) a thorough search for something (often causing disorder or confusion) | Synonyms: ransacking |
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| (noun) a jumble of things to be given away | - |
| rummer | (noun) a large drinking glass (ovoid bowl on a stem) for drinking toasts | - |
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| rummy | (noun) a card game based on collecting sets and sequences; the winner is the first to meld all their cards | Synonyms: rum |
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| (noun) a chronic drinker | Synonyms: drunk, drunkard, inebriate, sot, wino |
| rumor | (noun) gossip (usually a mixture of truth and untruth) passed around by word of mouth | Synonyms: hearsay, rumour |
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| rumormonger | (noun) a person given to gossiping and divulging personal information about others | Synonyms: gossip, gossiper, gossipmonger, newsmonger, rumourmonger |
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| rumour | (noun) gossip (usually a mixture of truth and untruth) passed around by word of mouth | Synonyms: hearsay, rumor |
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| rumourmonger | (noun) a person given to gossiping and divulging personal information about others | Synonyms: gossip, gossiper, gossipmonger, newsmonger, rumormonger |
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| rump | (noun) the part of an animal that corresponds to the human buttocks | Synonyms: croup, croupe, hindquarters |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, seat, stern, tail, tail end, tooshie, tush |
| (noun) fleshy hindquarters; behind the loin and above the round | - |
| rumpus | (noun) the act of making a noisy disturbance | Synonyms: commotion, din, ruckus, ruction, tumult |
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| rumrunner | (noun) someone who illegally smuggles liquor across a border | - |
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| sacrum | (noun) wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx | - |
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| scrum | (noun) (rugby) the method of beginning play in which the forwards of each team crouch side by side with locked arms; play starts when the ball is thrown in between them and the two sides compete for possession | Synonyms: scrummage |
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| scrummage | (noun) (rugby) the method of beginning play in which the forwards of each team crouch side by side with locked arms; play starts when the ball is thrown in between them and the two sides compete for possession | Synonyms: scrum |
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| scrumpy | (noun) strong cider (as made in western England) | - |
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| serum | (noun) an amber, watery fluid, rich in proteins, that separates out when blood coagulates | Synonyms: blood serum |
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| simulacrum | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: effigy, image |
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| (noun) an insubstantial or vague semblance | - |
| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| strum | (noun) sound of strumming | - |
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| struma | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, thyromegaly |
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| (noun) a form of tuberculosis characterized by swellings of the lymphatic glands | Synonyms: king's evil, scrofula |
| strumpet | (noun) a woman adulterer | Synonyms: adulteress, fornicatress, hussy, jade, loose woman, slut, trollop |
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| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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| thrum | (noun) a thrumming sound | - |
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