| abacus | (noun) a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves | - |
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| (noun) a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave | - |
| accusal | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusation |
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| accusation | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusal |
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| (noun) an assertion that someone is guilty of a fault or offence | Synonyms: charge |
| accusative | (adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes | Synonyms: objective |
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| (adjective) containing or expressing accusation | Synonyms: accusatory, accusing, accusive |
| (noun) the case of nouns serving as the direct object of a verb | Synonyms: accusative case, objective case |
| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| accusatory | (adjective) containing or expressing accusation | Synonyms: accusative, accusing, accusive |
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| accuse | (verb) bring an accusation against; level a charge against | Synonyms: criminate, impeach, incriminate |
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| (verb) blame for, make a claim of wrongdoing or misbehavior against | Synonyms: charge |
| accused | (noun) a defendant in a criminal proceeding | - |
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| accuser | (noun) someone who imputes guilt or blame | - |
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| accusing | (adjective) containing or expressing accusation | Synonyms: accusative, accusatory, accusive |
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| accusingly | (adverb) in an accusing manner | - |
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| accusive | (adjective) containing or expressing accusation | Synonyms: accusative, accusatory, accusing |
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| accustom | (verb) make psychologically or physically used (to something) | Synonyms: habituate |
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| accustomed | (adjective) commonly used or practiced; usual | Synonyms: customary, habitual, wonted |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
| bicuspidate | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspid |
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| caucus | (noun) a closed political meeting | - |
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| (verb) meet to select a candidate or promote a policy | - |
| circus | (noun) a performance given by a traveling company of acrobats, clowns, and trained animals | - |
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| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: carnival |
| (noun) an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent | - |
| (noun) (antiquity) an open-air stadium for chariot races and gladiatorial games | - |
| (noun) a travelling company of entertainers; including trained animals | - |
| coccus | (noun) any spherical or nearly spherical bacteria | Synonyms: cocci |
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| cocuswood | (noun) wood of the granadilla tree used for making musical instruments especially clarinets | Synonyms: cocoswood, granadilla wood |
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| concuss | (verb) injure the brain; sustain a concussion | - |
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| (verb) shake violently | - |
| concussion | (noun) injury to the brain caused by a blow; usually resulting in loss of consciousness | - |
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| (noun) any violent blow | - |
| crocus | (noun) any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated | - |
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| cuscus | (noun) woolly-haired monkey-like arboreal marsupial of New Guinea and northern Australia | - |
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| cushat | (noun) Eurasian pigeon with white patches on wings and neck | Synonyms: Columba palumbus, ringdove, wood pigeon |
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| cushaw | (noun) globose or ovoid squash with striped grey and green warty rind | - |
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| (noun) plant bearing squash having globose to ovoid fruit with variously striped grey and green and white warty rinds | Synonyms: Cucurbita argyrosperma, Cucurbita mixta |
| cushion | (noun) a soft bag filled with air or a mass of padding such as feathers or foam rubber etc. | - |
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| (noun) a mechanical damper; absorbs energy of sudden impulses | Synonyms: shock, shock absorber |
| (noun) the layer of air that supports a hovercraft or similar vehicle | - |
| (verb) protect from impact | Synonyms: buffer, soften |
| cushioned | (adjective) softened by the addition of cushions or padding | Synonyms: cushiony, padded |
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| cushioning | (noun) artifact consisting of soft or resilient material used to fill or give shape or protect or add comfort | Synonyms: padding |
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| cushiony | (adjective) softened by the addition of cushions or padding | Synonyms: cushioned, padded |
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| cushy | (adjective) not burdensome or demanding; borne or done easily and without hardship | Synonyms: easygoing, soft |
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| cusk | (noun) large edible marine fish of northern coastal waters; related to cod | Synonyms: Brosme brosme, torsk |
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| (noun) elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth | Synonyms: burbot, eelpout, ling, Lota lota |
| (noun) the lean flesh of a cod-like fish of North Atlantic waters | - |
| cusp | (noun) point formed by two intersecting arcs (as from the intrados of a Gothic arch) | - |
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| (noun) small elevation on the grinding surface of a tooth | - |
| (noun) a thin triangular flap of a heart valve | Synonyms: leaflet |
| cuspate | (adjective) having cusps or points | Synonyms: cuspated, cusped, cuspidal, cuspidate, cuspidated |
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| cuspated | (adjective) having cusps or points | Synonyms: cuspate, cusped, cuspidal, cuspidate, cuspidated |
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| cusped | (adjective) having cusps or points | Synonyms: cuspate, cuspated, cuspidal, cuspidate, cuspidated |
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| cuspid | (noun) one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars | Synonyms: canine, canine tooth, dogtooth, eye tooth, eyetooth |
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| cuspidal | (adjective) having cusps or points | Synonyms: cuspate, cuspated, cusped, cuspidate, cuspidated |
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| cuspidate | (adjective) having cusps or points | Synonyms: cuspate, cuspated, cusped, cuspidal, cuspidated |
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| cuspidated | (adjective) having cusps or points | Synonyms: cuspate, cuspated, cusped, cuspidal, cuspidate |
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| cuspidation | (noun) a decoration using cusps | - |
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| cuspidor | (noun) a receptacle for spit (usually in a public place) | Synonyms: spittoon |
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| cuss | (noun) profane or obscene expression usually of surprise or anger | Synonyms: curse, curse word, expletive, oath, swearing, swearword |
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| (noun) a persistently annoying person | Synonyms: blighter, gadfly, pest, pesterer |
| (noun) a boy or man | Synonyms: blighter, bloke, chap, fella, feller, fellow, gent, lad |
| (verb) utter obscenities or profanities | Synonyms: blaspheme, curse, imprecate, swear |
| cussed | (adjective) stubbornly persistent in wrongdoing | Synonyms: obdurate, obstinate, unrepentant |
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| cussedly | (adverb) in a stubborn unregenerate manner | Synonyms: mulishly, obdurately, obstinately, pig-headedly, stubbornly |
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| cussedness | (noun) meanspirited disagreeable contrariness | Synonyms: orneriness |
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| custard | (noun) sweetened mixture of milk and eggs baked or boiled or frozen | - |
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| custodial | (adjective) providing protective supervision; watching over or safeguarding | Synonyms: tutelar, tutelary |
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| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| custodianship | (noun) the position of custodian | - |
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| custody | (noun) holding by the police | - |
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| (noun) (with `in') guardianship over; in divorce cases it is the right to house and care for and discipline a child | Synonyms: hands |
| (noun) a state of being confined (usually for a short time) | Synonyms: detainment, detention, hold |
| custom | (adjective) made according to the specifications of an individual | Synonyms: custom-made |
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| (noun) accepted or habitual practice | Synonyms: usage, usance |
| (noun) habitual patronage | - |
| (noun) a specific practice of long standing | Synonyms: tradition |
| (noun) money collected under a tariff | Synonyms: customs, customs duty, impost |
| customarily | (adverb) by custom; according to common practice | - |
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| customariness | (noun) The state or quality of agreeing with, or being established by, custom or common usage. | - |
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| customary | (adjective) in accordance with convention or custom | - |
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| (adjective) commonly used or practiced; usual | Synonyms: accustomed, habitual, wonted |
| customer | (noun) someone who pays for goods or services | Synonyms: client |
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| customhouse | (noun) a government building where customs are collected and where ships are cleared to enter or leave the country | Synonyms: customshouse |
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| customise | (verb) make according to requirements | Synonyms: customize |
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| (verb) make to specifications | Synonyms: custom-make, customize, tailor-make |
| customize | (verb) make according to requirements | Synonyms: customise |
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| (verb) make to specifications | Synonyms: custom-make, customise, tailor-make |
| customs | (noun) money collected under a tariff | Synonyms: custom, customs duty, impost |
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| customshouse | (noun) a government building where customs are collected and where ships are cleared to enter or leave the country | Synonyms: customhouse |
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| decussate | (adjective) crossed or intersected in the form of an X | Synonyms: intersectant, intersecting |
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| (verb) cross or intersect so as to form a cross | - |
| decussation | (noun) an intersection or crossing of two tracts in the form of the letter X | Synonyms: chiasm, chiasma |
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| diplococcus | (noun) Gram-positive bacteria usually occurring in pairs | - |
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| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| discus | (noun) a disk used in throwing competitions | Synonyms: saucer |
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| (noun) an athletic competition in which a disk-shaped object is thrown as far as possible | - |
| discuss | (verb) speak with others about (something); talk (something) over in detail; have a discussion | Synonyms: hash out, talk over |
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| (verb) to consider or examine in speech or writing | Synonyms: discourse, talk about |
| discussant | (noun) a participant in a formal discussion | - |
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| discussion | (noun) an exchange of views on some topic | Synonyms: give-and-take, word |
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| (noun) an extended communication (often interactive) dealing with some particular topic | Synonyms: discourse, treatment |
| echinococcus | (noun) tapeworms whose larvae are parasitic in humans and domestic animals | - |
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| excusable | (adjective) capable of being overlooked | - |
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| (adjective) easily excused or forgiven | Synonyms: forgivable, venial |
| excusably | (adverb) in an excusable manner or to an excusable degree | Synonyms: forgivably, pardonably |
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| excusatory | (adjective) offering or expressing apology | Synonyms: apologetic |
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| excuse | (noun) a poor example | Synonyms: apology |
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| (noun) a defense of some offensive behavior or some failure to keep a promise etc. | Synonyms: alibi, exculpation, self-justification |
| (noun) a note explaining an absence | - |
| (verb) accept an excuse for | Synonyms: pardon |
| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologise, apologize, rationalise, rationalize |
| (verb) excuse, overlook, or make allowances for; be lenient with | Synonyms: condone |
| (verb) serve as a reason or cause or justification of | Synonyms: explain |
| (verb) grant exemption or release to | Synonyms: exempt, let off, relieve |
| (verb) ask for permission to be released from an engagement | Synonyms: beg off |
| excused | (adjective) granted exemption | - |
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| excuser | (noun) a person who pardons or forgives or excuses a fault or offense | Synonyms: forgiver, pardoner |
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| focus | (noun) maximum clarity or distinctness of an image rendered by an optical system | - |
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| (noun) maximum clarity or distinctness of an idea | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focusing, focussing |
| (noun) a fixed reference point on the concave side of a conic section | - |
| (noun) a point of convergence of light (or other radiation) or a point from which it diverges | Synonyms: focal point |
| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, nidus |
| (noun) special emphasis attached to something | Synonyms: stress |
| (verb) become focussed or come into focus | Synonyms: focalise, focalize |
| (verb) put (an image) into focus | Synonyms: focalise, focalize, sharpen |
| (verb) direct one's attention on something | Synonyms: center, centre, concentrate, pore, rivet |
| (verb) bring into focus or alignment; to converge or cause to converge; of ideas or emotions | Synonyms: concenter, concentre, focalise, focalize |
| (verb) cause to converge on or toward a central point | - |
| focused | (adjective) being in focus or brought into focus | Synonyms: focussed |
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| (adjective) of an optical system (e.g. eye or opera glasses) adjusted to produce a clear image | - |
| (adjective) (of light rays) converging on a point | Synonyms: focussed |
| focusing | (noun) the act of bringing into focus | Synonyms: focalisation, focalization |
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| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focussing |
| focussed | (adjective) being in focus or brought into focus | Synonyms: focused |
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| (adjective) (of light rays) converging on a point | Synonyms: focused |
| focussing | (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focusing |
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| fucus | (noun) any member of the genus Fucus | - |
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| gonococcus | (noun) the pus-producing bacterium that causes gonorrhea | Synonyms: Neisseria gonorrhoeae |
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| hibiscus | (noun) any plant of the genus Hibiscus | - |
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| hyperacusia | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusis |
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| hyperacusis | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusia |
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| incus | (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: anvil |
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| inexcusable | (adjective) without excuse or justification | - |
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| (adjective) not excusable | Synonyms: unforgivable |
| inexcusably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: unforgivably, unpardonably |
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| (adverb) without any excuse | Synonyms: unjustifiably |
| iridoncus | (noun) swelling of the iris of the eye | - |
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| lacustrine | (adjective) of or relating to or living near lakes | - |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| lobscuse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscouse, scouse |
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| locus | (noun) the set of all points or lines that satisfy or are determined by specific conditions | - |
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| (noun) the scene of any event or action (especially the place of a meeting) | Synonyms: locale, venue |
| (noun) the specific site of a particular gene on its chromosome | - |
| locust | (noun) migratory grasshoppers of warm regions having short antennae | - |
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| (noun) any of various hardwood trees of the family Leguminosae | Synonyms: locust tree |
| (noun) hardwood from any of various locust trees | - |
| macushla | (noun) (an Irish term of address expressing affection) darling | - |
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| meniscus | (noun) (physics) the curved upper surface of a nonturbulent liquid in a vertical tube | - |
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| (noun) (optics) a lens that is concave on one side and convex on the other | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |