| 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 | - |
| 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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| 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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| 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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| 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 |
| 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 | - |
| fulcrum | (noun) the pivot about which a lever turns | - |
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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 |
| 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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| 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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| 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 | - |
| 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 | - |
| 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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| 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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| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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| thrum | (noun) a thrumming sound | - |
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| variorum | (noun) an edition containing various versions of a text or notes by various scholars or editors | Synonyms: variorum edition |
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