| aboveboard | (adjective) without concealment or deception; honest | Synonyms: straightforward |
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| (adverb) in an honest manner | Synonyms: honestly |
| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| addlebrained | (adjective) stupid and confused | Synonyms: addlepated, muddleheaded, puddingheaded |
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| afebrile | (adjective) having no fever | - |
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| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| algebra | (noun) the mathematics of generalized arithmetical operations | - |
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| algebraic | (adjective) of or relating to algebra | Synonyms: algebraical |
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| algebraical | (adjective) of or relating to algebra | Synonyms: algebraic |
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| algebraically | (adverb) in an algebraic manner | - |
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| algebraist | (noun) a mathematician whose specialty is algebra | - |
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| ameba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: amoeba |
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| ameban | (adjective) pertaining to or resembling amoebae | Synonyms: amebic, amebous, amoeban, amoebic, amoebous |
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| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| amebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebous, amoeban, amoebic, amoebous |
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| amebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amoebiasis, amoebiosis |
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| ameboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: amoeboid |
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| amebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amoeban, amoebic, amoebous |
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| amoeba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: ameba |
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| amoeban | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoebic, amoebous |
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| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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| amoebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebous |
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| amoebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiasis |
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| amoeboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: ameboid |
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| amoebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebic |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| antebellum | (adjective) belonging to a period before a war especially the American Civil War | - |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| ardeb | (noun) a unit of dry measure used in Egypt | - |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| baneberry | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: cohosh, herb Christopher |
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| (noun) a poisonous berry of a plant of the genus Actaea | - |
| bareback | (adjective) riding without a saddle | Synonyms: barebacked |
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| (adverb) without a saddle | Synonyms: barebacked |
| barebacked | (adjective) riding without a saddle | Synonyms: bareback |
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| (adverb) without a saddle | Synonyms: bareback |
| bareboat | (noun) a vessel (such as a yacht) that can be chartered without a captain or crew or provisions | - |
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| bareboating | (noun) boating by chartering a bareboat and providing your own crew and provisions | - |
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| baseball | (noun) a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs | Synonyms: ball, baseball game |
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| (noun) a ball used in playing baseball | - |
| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |
| bebop | (noun) an early form of modern jazz (originating around 1940) | Synonyms: bop |
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| (verb) dance the bebop | Synonyms: bop |
| beebalm | (noun) bushy perennial Old World mint having small white or yellowish flowers and fragrant lemon-flavored leaves; a garden escapee in northern Europe and North America | Synonyms: bee balm, garden balm, lemon balm, Melissa officinalis, sweet balm |
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| (noun) perennial aromatic herb of eastern North America having variously colored tubular flowers in dense showy heads | Synonyms: bee balm, bergamot mint, Monarda didyma, oswego tea |
| (noun) perennial herb of North America | Synonyms: bee balm, Monarda fistulosa |
| beebread | (noun) a mixture of nectar and pollen prepared by worker bees and fed to larvae | Synonyms: ambrosia |
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| belieber | (noun) A fan of Justin Bieber | - |
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| blaeberry | (noun) erect European blueberry having solitary flowers and blue-black berries | Synonyms: bilberry, Viccinium myrtillus, whinberry, whortleberry |
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| bleb | (noun) (pathology) an elevation of the skin filled with serous fluid | Synonyms: blister, bulla |
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| blebbed | (adjective) (of glass or quartzite) marred by small bubbles or small particles of foreign material | Synonyms: blebby |
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| blebby | (adjective) (of glass or quartzite) marred by small bubbles or small particles of foreign material | Synonyms: blebbed |
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| (adjective) covered with small blisters | Synonyms: blistery |
| bluebell | (noun) one of the most handsome prairie wildflowers having large erect bell-shaped bluish flowers; of moist places in prairies and fields from eastern Colorado and Nebraska south to New Mexico and Texas | Synonyms: Eustoma grandiflorum, prairie gentian, tulip gentian |
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| (noun) perennial of Northern Hemisphere with slender stems and bell-shaped blue flowers | Synonyms: Campanula rotundifolia, harebell |
| (noun) sometimes placed in genus Scilla | Synonyms: harebell, Hyacinthoides nonscripta, Scilla nonscripta, wild hyacinth, wood hyacinth |
| blueberry | (noun) sweet edible dark-blue berries of either low-growing or high-growing blueberry plants | - |
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| (noun) any of numerous shrubs of the genus Vaccinium bearing blueberries | Synonyms: blueberry bush |
| bluebill | (noun) diving ducks of North America having a bluish-grey bill | Synonyms: broadbill, scaup, scaup duck |
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| bluebird | (noun) blue North American songbird | - |
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| (noun) fruit-eating mostly brilliant blue songbird of the East Indies | Synonyms: fairy bluebird |
| bluebonnet | (noun) a brimless dark blue Scottish cap with a flat top and a plume on one side | Synonyms: Balmoral |
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| (noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States | Synonyms: buffalo clover, Lupinus subcarnosus, Texas bluebonnet |
| bluebottle | (noun) blowfly with iridescent blue body; makes a loud buzzing noise in flight | Synonyms: Calliphora vicina |
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| (noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers | Synonyms: bachelor's button, Centaurea cyanus, cornflower |
| bottlebrush | (noun) a cylindrical brush on a thin shaft that is used to clean bottles | - |
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| brittlebush | (noun) fragrant rounded shrub of southwestern United States and adjacent Mexico having brittle stems and small crowded blue-green leaves and yellow flowers; produces a resin used in incense and varnish and in folk medicine | Synonyms: brittle bush, Encelia farinosa, incienso |
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| bumblebee | (noun) robust hairy social bee of temperate regions | Synonyms: humblebee |
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| candleberry | (noun) deciduous aromatic shrub of eastern North America with grey-green wax-coated berries | Synonyms: bayberry, Myrica pensylvanica, swamp candleberry, waxberry |
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| canebrake | (noun) a dense growth of cane (especially giant cane) | - |
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| casebook | (adjective) according to or characteristic of a casebook or textbook; typical | Synonyms: textbook |
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| (noun) a book in which detailed written records of a case are kept and which are a source of information for subsequent work | - |
| celebrant | (noun) an officiating priest celebrating the Eucharist | - |
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| (noun) a person who is celebrating | Synonyms: celebrater, celebrator |
| celebrate | (verb) have a celebration | Synonyms: fete |
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| (verb) behave as expected during of holidays or rites | Synonyms: keep, observe |
| (verb) assign great social importance to | Synonyms: lionise, lionize |
| celebrated | (adjective) having an illustrious past | Synonyms: historied, storied |
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| (adjective) widely known and esteemed | Synonyms: famed, famous, far-famed, illustrious, notable, noted, renowned |
| celebrater | (noun) a person who is celebrating | Synonyms: celebrant, celebrator |
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| celebration | (noun) any joyous diversion | Synonyms: festivity |
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| (noun) the public performance of a sacrament or solemn ceremony with all appropriate ritual | Synonyms: solemnisation, solemnization |
| (noun) a joyful occasion for special festivities to mark some happy event | Synonyms: jubilation |
| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| celebratory | (adjective) used for celebrating | - |
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| celebrity | (noun) a widely known person | Synonyms: famous person |
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| (noun) the state or quality of being widely honored and acclaimed | Synonyms: fame, renown |
| centreboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centerboard, drop keel, sliding keel |
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| cerebellar | (adjective) relating to or associated with the cerebellum | - |
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| cerebellum | (noun) a major division of the vertebrate brain; situated above the medulla oblongata and beneath the cerebrum in humans | - |
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| cerebral | (adjective) involving intelligence rather than emotions or instinct | Synonyms: intellectual |
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| (adjective) of or relating to the cerebrum or brain | - |
| cerebrally | (adverb) in the brain | - |
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| (adverb) in an intellectual manner | - |
| cerebrate | (verb) use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments | Synonyms: cogitate, think |
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| cerebration | (noun) the process of using your mind to consider something carefully | Synonyms: intellection, mentation, thinking, thought, thought process |
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| cerebromeningitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: encephalomeningitis, meningoencephalitis |
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| cerebroside | (noun) A cerebroside is any of various organic lipid compounds containing glucose or galactose and glucose; it occurs in the myelin sheath of cerebrospinal neurons. | - |
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| cerebrospinal | (adjective) of or relating to the brain and spinal cord | - |
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| cerebrovascular | (adjective) of or relating to the brain and the blood vessels that supply it | - |
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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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| chebab | (noun) a Palestinian juvenile 10-15 years old who fights against the Israelis | - |
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| cheeseboard | (noun) tray on which cheeses are served | Synonyms: cheese tray |
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| cheeseburger | (noun) a hamburger with melted cheese on it | - |
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| chequebook | (noun) a book issued to holders of checking accounts | Synonyms: checkbook |
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| cobweb | (noun) a dense elaborate spider web that is more efficient than the orb web | - |
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| (noun) filaments from a web that was spun by a spider | Synonyms: gossamer |
| (noun) a fabric so delicate and transparent as to resemble a web of a spider | - |
| cobwebby | (adjective) covered with cobwebs | - |
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| (adjective) so thin as to transmit light | Synonyms: diaphanous, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
| cocklebur | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cockleburr |
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| (noun) burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use | Synonyms: Arctium lappa, great burdock, greater burdock |
| cockleburr | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cocklebur |
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| coffeeberry | (noun) evergreen shrub of western United States bearing small red or black fruits | Synonyms: California buckthorn, California coffee, Rhamnus californicus |
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| comeback | (noun) return by a celebrity to some previously successful activity | - |
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| (noun) a quick reply to a question or remark (especially a witty or critical one) | Synonyms: counter, rejoinder, replication, retort, return, riposte |
| corynebacterium | (noun) any species of the genus Corynebacterium | - |
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| cubeb | (noun) a cigarette containing cubeb | Synonyms: cubeb cigarette |
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| (noun) tropical southeast Asian shrubby vine bearing spicy berrylike fruits | Synonyms: cubeb vine, Java pepper, Piper cubeba |
| (noun) spicy fruit of the cubeb vine; when dried and crushed is used medicinally or in perfumery and sometimes smoked in cigarettes | - |
| dangleberry | (noun) huckleberry of the eastern United States with pink flowers and sweet blue fruit | Synonyms: dangle-berry, Gaylussacia frondosa |
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| deb | (noun) a young woman making her debut into society | Synonyms: debutante |
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| debacle | (noun) a sound defeat | Synonyms: drubbing, slaughter, thrashing, trouncing, walloping, whipping |
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| (noun) a sudden and violent collapse | Synonyms: fiasco |
| (noun) flooding caused by a tumultuous breakup of ice in a river during the spring or summer | - |
| debar | (verb) prevent from entering; keep out | Synonyms: bar, exclude |
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| (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, deflect, fend off, forefend, forfend, head off, obviate, stave off, ward off |
| (verb) bar temporarily; from school, office, etc. | Synonyms: suspend |
| debark | (verb) go ashore | Synonyms: disembark, set down |
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| debarkation | (noun) the act of passengers and crew getting off of a ship or aircraft | Synonyms: disembarkation, disembarkment |
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| debarment | (noun) the act of prevention by legal means | - |
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| (noun) the state of being debarred (excluded from enjoying certain possessions or rights or practices) | - |
| debase | (verb) lower in value by increasing the base-metal content | Synonyms: alloy |
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| (verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones | Synonyms: adulterate, dilute, load, stretch |
| (verb) corrupt morally or by intemperance or sensuality | Synonyms: corrupt, debauch, demoralise, demoralize, deprave, misdirect, pervert, profane, subvert, vitiate |
| debased | (adjective) ruined in character or quality | Synonyms: corrupted, vitiated |
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| (adjective) mixed with impurities | Synonyms: adulterate, adulterated |
| (adjective) lowered in value | Synonyms: degraded, devalued |
| debasement | (noun) changing to a lower state (a less respected state) | Synonyms: degradation |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: adulteration |