| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archdiocese | (noun) the diocese of an archbishop | - |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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| aridity | (noun) the quality of yielding nothing of value | Synonyms: barrenness, fruitlessness |
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| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridness, thirstiness |
| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| ascendible | (adjective) capable of being ascended | Synonyms: ascendable, climbable |
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| ascending | (adjective) moving or going or growing upward | - |
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| (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| asdic | (noun) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return | Synonyms: echo sounder, sonar |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| astounding | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astonishing, staggering, stupefying |
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| (adjective) bewildering or striking dumb with wonder | Synonyms: dumbfounding, dumfounding |
| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| attending | (adjective) giving practical help to | Synonyms: ministrant |
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| (noun) the act of being present (at a meeting or event etc.) | Synonyms: attendance |
| (noun) the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others | Synonyms: attention |
| attitudinal | (adjective) of or relating to attitudes | - |
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| attitudinise | (verb) assume certain affected attitudes | Synonyms: attitudinize |
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| attitudinize | (verb) assume certain affected attitudes | Synonyms: attitudinise |
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| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audibly | (adverb) in an audible manner | - |
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| audience | (noun) a conference (usually with someone important) | Synonyms: consultation, interview |
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| (noun) a gathering of spectators or listeners at a (usually public) performance | - |
| (noun) the part of the general public interested in a source of information, entertainment, or a product/service | - |
| (noun) an opportunity to state your case and be heard | Synonyms: hearing |
| audile | (adjective) of or relating to the process of hearing | Synonyms: auditive, auditory |
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| (noun) one whose mental imagery is auditory rather than visual or motor | - |
| audio | (noun) the sound elements of television | - |
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| (noun) a recording of acoustic signals | Synonyms: audio recording, sound recording |
| (noun) an audible acoustic wave frequency | Synonyms: audio frequency |
| (noun) the audible part of a transmitted signal | Synonyms: sound |
| audiocassette | (noun) a cassette for audiotape | - |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
| audit | (noun) a methodical examination or review of a condition or situation | - |
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| (noun) an inspection of the accounting procedures and records by a trained accountant or CPA | Synonyms: audited account |
| (verb) attend academic courses without getting credit | - |
| (verb) examine carefully for accuracy with the intent of verification | Synonyms: inspect, scrutinise, scrutinize |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| (verb) perform in order to get a role | Synonyms: try out |
| auditive | (adjective) of or relating to the process of hearing | Synonyms: audile, auditory |
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| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| auditory | (adjective) of or relating to the process of hearing | Synonyms: audile, auditive |
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| autodidact | (noun) a person who has taught himself | - |
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| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| awarding | (noun) a grant made by a law court | Synonyms: award |
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| azadirachtin | (noun) insecticide | - |
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| backgrounding | (noun) the execution of low priority programs while higher priority programs are not using the processing system | Synonyms: background processing |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| baddie | (noun) the principal bad character in a film or work of fiction | Synonyms: villain |
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| badinage | (noun) frivolous banter | - |
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| balding | (adjective) getting bald | - |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| bandicoot | (noun) any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous | - |
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| banding | (noun) an adornment consisting of a strip of a contrasting color or material | Synonyms: band, stripe |
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| (noun) a stripe or stripes of contrasting color | Synonyms: band, stria, striation |
| bandit | (noun) an armed thief who is (usually) a member of a band | Synonyms: brigand |
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| banditry | (noun) the practice of plundering in gangs | - |
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| bardic | (adjective) being a bard or relating to a bard's poetry | - |
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| barramundi | (noun) a species of large perch noted for its sporting and eating qualities; lives in marine, estuary, and freshwater habitats | Synonyms: Asian seabass, giant perch, giant seaperch, Lates calcarifer, white seabass |
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| basidial | (adjective) relating to or characterized by basidia | - |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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| bastardise | (verb) declare a child to be illegitimate | Synonyms: bastardize |
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| (verb) change something so that its value declines; for example, art forms | Synonyms: bastardize |
| bastardised | (adjective) deriving from more than one source or style | Synonyms: bastardized |
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| bastardization | (noun) an act that debases or corrupts | Synonyms: bastardisation |
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| (noun) declaring or rendering bastard | - |
| bastardize | (verb) declare a child to be illegitimate | Synonyms: bastardise |
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| (verb) change something so that its value declines; for example, art forms | Synonyms: bastardise |
| bastardized | (adjective) deriving from more than one source or style | Synonyms: bastardised |
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| bawdily | (adverb) in a bawdy manner | - |
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| bawdiness | (noun) the trait of behaving in an obscene manner | Synonyms: lewdness, obscenity, salaciousness, salacity |
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| beading | (noun) a beaded molding for edging or decorating furniture | Synonyms: astragal, bead, beadwork |
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| (noun) ornamentation with beads | Synonyms: beadwork |
| bedding | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedclothes |
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| (noun) material used to provide a bed for animals | Synonyms: bedding material, litter |
| bedight | (verb) decorate | Synonyms: bedeck, deck |
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| bedim | (verb) make darker and difficult to perceive by sight | Synonyms: benight |
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| (verb) make unintelligible or unclear | Synonyms: obscure, overcloud |
| bedimmed | (adjective) made dim or indistinct | - |
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| bedizen | (verb) dress up garishly and tastelessly | Synonyms: dizen |
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| (verb) decorate tastelessly | - |
| beheading | (noun) killing by cutting off the head | Synonyms: decapitation |
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| (noun) execution by cutting off the victim's head | Synonyms: decapitation |
| beholding | (noun) perception by means of the eyes | Synonyms: seeing, visual perception |
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| bending | (noun) the act of bending something | - |
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| (noun) the property of being bent or deflected | Synonyms: deflection, deflexion |
| (noun) movement that causes the formation of a curve | Synonyms: bend |
| benedick | (noun) a newly married man (especially one who has long been a bachelor) | Synonyms: benedict |
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| benedict | (noun) a newly married man (especially one who has long been a bachelor) | Synonyms: benedick |
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| benedictine | (noun) a French liqueur originally made by Benedictine monks | - |
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| benediction | (noun) the act of praying for divine protection | Synonyms: blessing |
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| (noun) a ceremonial prayer invoking divine protection | Synonyms: blessing |
| benedictive | (adjective) expressing benediction | Synonyms: benedictory |
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| benedictory | (adjective) expressing benediction | Synonyms: benedictive |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| bidding | (noun) a request to be present | Synonyms: summons |
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| (noun) (bridge) the number of tricks a bridge player is willing to contract to make | Synonyms: bid |
| (noun) an authoritative direction or instruction to do something | Synonyms: bid, command, dictation |
| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| binding | (adjective) executed with proper legal authority | - |
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| (noun) the act of applying a bandage | Synonyms: bandaging, dressing |
| (noun) the protective covering on the front, back, and spine of a book | Synonyms: back, book binding, cover |
| (noun) strip sewn over or along an edge for reinforcement or decoration | - |
| (noun) one of a pair of mechanical devices that are attached to a ski and that will grip a ski boot; the bindings should release in case of a fall | Synonyms: ski binding |
| (noun) the capacity to attract and hold something | - |
| biodiversity | (noun) the diversity of plant and animal life in a particular habitat (or in the world as a whole) | - |
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