| arthritic | (adjective) of or pertaining to arthritis | Synonyms: creaky, rheumatic, rheumatoid, rheumy |
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| (noun) a person afflicted with arthritis | - |
| arthritis | (noun) inflammation of a joint or joints | - |
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| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| ascribable | (adjective) capable of being assigned or credited to | Synonyms: due, imputable, referable |
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| ascribe | (verb) attribute or credit to | Synonyms: assign, attribute, impute |
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| ascription | (noun) assigning to a cause or source | Synonyms: attribution |
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| (noun) assigning some quality or character to a person or thing | Synonyms: attribution |
| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| aspiring | (adjective) desiring or striving for recognition or advancement | Synonyms: aspirant, wishful |
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| assuring | (adjective) giving confidence | - |
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| asteriated | (adjective) (of some crystals especially gemstones) exhibiting asterism | - |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| (verb) mark with an asterisk | Synonyms: star |
| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asterismal | (adjective) relating to asterisms or constellations | - |
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| astride | (adverb) with one leg on each side | Synonyms: astraddle |
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| (adverb) with the legs stretched far apart | - |
| astringe | (verb) become constricted or compressed | - |
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| (verb) constrict or bind or draw together | - |
| astringence | (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringency |
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| astringency | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: stypsis |
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| (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringence |
| astringent | (adjective) tending to draw together or constrict soft organic tissue | - |
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| (adjective) sour or bitter in taste | Synonyms: acerb, acerbic |
| (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
| asymmetric | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetrical |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| asymmetrically | (adverb) in an asymmetrical manner | Synonyms: unsymmetrically |
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| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atrial | (adjective) of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart) | - |
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| atrioventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: auriculoventricular |
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| atrip | (adjective) (of an anchor) just clear of the bottom | Synonyms: aweigh |
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| atrium | (noun) the central area in a building; open to the sky | - |
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| (noun) any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) | - |
| attributable | (adjective) capable of being attributed | - |
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| attribute | (noun) an abstraction belonging to or characteristic of an entity | - |
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| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: dimension, property |
| (verb) attribute or credit to | Synonyms: ascribe, assign, impute |
| (verb) decide as to where something belongs in a scheme | Synonyms: assign |
| attribution | (noun) assigning to a cause or source | Synonyms: ascription |
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| (noun) assigning some quality or character to a person or thing | Synonyms: ascription |
| attributive | (adjective) of adjectives; placed before the nouns they modify | Synonyms: prenominal |
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| attributively | (adverb) in an attributive manner | - |
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| attrited | (adjective) worn by rubbing or friction | - |
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| attrition | (noun) the act of rubbing together; wearing something down by friction | - |
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| (noun) a wearing down to weaken or destroy | - |
| (noun) sorrow for sin arising from fear of damnation | Synonyms: contriteness, contrition |
| (noun) the wearing down of rock particles by friction due to water or wind or ice | Synonyms: abrasion, detrition, grinding |
| (noun) erosion by friction | Synonyms: abrasion, corrasion, detrition |
| attritional | (adjective) relating to or caused by attrition | - |
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| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| audiometric | (adjective) of or relating to audiometry | - |
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| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| auric | (adjective) of or relating to or containing or derived from gold | Synonyms: aurous |
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| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculare | (noun) the craniometric point at the center of the opening of the external acoustic meatus | Synonyms: auricular point |
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| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| auriform | (adjective) having a shape resembling an ear | Synonyms: ear-like, ear-shaped |
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| aurify | (verb) turn golden | - |
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| (verb) transform into gold | - |
| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| avarice | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avaritia, covetousness, greed, rapacity |
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| (noun) extreme greed for material wealth | Synonyms: avariciousness, covetousness, cupidity |
| avaricious | (adjective) immoderately desirous of acquiring e.g. wealth | Synonyms: covetous, grabby, grasping, greedy, prehensile |
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| avariciously | (adverb) in a greedy manner | Synonyms: covetously, greedily |
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| avariciousness | (noun) extreme greed for material wealth | Synonyms: avarice, covetousness, cupidity |
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| avaritia | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avarice, covetousness, greed, rapacity |
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| aventurine | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: sunstone |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| awestricken | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestruck |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| azoturia | (noun) excess of urea in the urine | - |
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| azurite | (noun) blue carbonate of copper; blue malachite | - |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bacterially | (adverb) by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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