| abarticulation | (noun) dislocation of a joint | - |
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| abasic | (adjective) of or relating to abasia (inability to walk) | Synonyms: abatic |
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| abatic | (adjective) of or relating to abasia (inability to walk) | Synonyms: abasic |
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| abdicable | (adjective) capable of being discarded or renounced or relinquished | - |
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| abdicate | (verb) give up, such as power, as of monarchs and emperors, or duties and obligations | Synonyms: renounce |
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| abdication | (noun) a formal resignation and renunciation of powers | Synonyms: stepping down |
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| (noun) the act of abdicating | Synonyms: stepping down |
| abdicator | (noun) one who formally relinquishes an office or responsibility | - |
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| abdominovesical | (adjective) of or relating to the abdomen and the urinary bladder | - |
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| abiogenetic | (adjective) originating by abiogenesis | - |
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| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| aboulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: abulic |
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| absolutistic | (adjective) pertaining to the principle of totalitarianism | Synonyms: absolutist |
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| abulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: aboulic |
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| academic | (adjective) associated with academia or an academy | - |
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| (adjective) marked by a narrow focus on or display of learning especially its trivial aspects | Synonyms: donnish, pedantic |
| (adjective) hypothetical or theoretical and not expected to produce an immediate or practical result | - |
| (noun) an educator who works at a college or university | Synonyms: academician, faculty member |
| academically | (adverb) in regard to academic matters | - |
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| academician | (noun) an educator who works at a college or university | Synonyms: academic, faculty member |
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| (noun) a scholar who is skilled in academic disputation | Synonyms: schoolman |
| (noun) someone elected to honorary membership in an academy | - |
| academicianship | (noun) the position of member of an honorary academy | - |
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| academicism | (noun) orthodoxy of a scholastic variety | Synonyms: academism, scholasticism |
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| (noun) Purely speculative thoughts and attitudes. | - |
| (noun) a style of painting and sculpture produced under the influence of European academies of art. | Synonyms: academic art, academism |
| acanthotic | (adjective) of or relating to or having acanthosis | - |
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| acapnic | (adjective) relating to or demonstrating acapnia | Synonyms: acapnial, acapnotic |
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| acapnotic | (adjective) relating to or demonstrating acapnia | Synonyms: acapnial, acapnic |
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| acaricide | (noun) a chemical agent used to kill mites | Synonyms: acaracide |
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| acatalectic | (adjective) (verse) metrically complete; especially having the full number of syllables in the final metrical foot | - |
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| (noun) (prosody) a line of verse that has the full number of syllables | - |
| accomplice | (noun) a person who joins with another in carrying out some plan (especially an unethical or illegal plan) | Synonyms: confederate |
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| acentric | (adjective) lacking a centromere | - |
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| (adjective) not centered or having no center | - |
| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acetic | (adjective) relating to or containing acetic acid | - |
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| acetonic | (adjective) of or relating to acetone | - |
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| acetylenic | (adjective) of or related to acetylene | - |
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| acetylic | (adjective) of or related to acetic acid | - |
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| achlorhydric | (adjective) lacking hydrochloric acid | - |
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| achondritic | (adjective) not having a granular structure | - |
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| (adjective) of or related to an achondrite | - |
| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromic | (adjective) having no color | Synonyms: achromous |
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| acicula | (noun) a needlelike part or structure of a plant or animal or crystal; as a spine or bristle or crystal | - |
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| acicular | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acerose, needle-shaped |
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| aciculate | (adjective) related to plants or animals or crystals having aciculae or needlelike parts | - |
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| acidic | (adjective) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) | - |
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| (adjective) being sour to the taste | Synonyms: acid, acidulent, acidulous |
| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidotic | (adjective) having or being characterized by acidosis | - |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acinic | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinose, acinous |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| (noun) a remedy for hearing loss or deafness | - |
| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acoustically | (adverb) with respect to acoustics | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrocentric | (adjective) having a subterminal centromere | - |
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| acrogenic | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenous |
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| acromegalic | (adjective) marked or affected by enlargement or hypertrophy of the extremities or the face | - |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| acroscopic | (adjective) facing or on the side toward the apex | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| acrylic | (noun) a synthetic fabric made from polyacrylonitrile | - |
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| (noun) used especially by artists | Synonyms: acrylic paint |
| (noun) a glassy thermoplastic; can be cast and molded or used in coatings and adhesives | Synonyms: acrylate resin, acrylic resin |
| (noun) polymerized from acrylonitrile | Synonyms: acrylic fiber |
| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| addict | (noun) someone who is physiologically dependent on a substance or activity | - |
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| (noun) someone who is so ardently devoted to something that it resembles an addiction | Synonyms: freak, junkie, junky, nut |
| (verb) to cause (someone or oneself) to become dependent (on something, especially a narcotic drug) | Synonyms: hook |
| addicted | (adjective) compulsively or physiologically dependent on something habit-forming | - |
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| addiction | (noun) (Roman law) a formal award by a magistrate of a thing or person to another person (as the award of a debtor to his creditor); a surrender to a master | - |
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| (noun) an abnormally strong craving | - |
| (noun) being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs) | Synonyms: dependance, dependence, dependency, habituation |
| addictive | (adjective) causing or characterized by addiction | Synonyms: habit-forming |
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| adiabatic | (adjective) occurring without loss or gain of heat | - |
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| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adjudicate | (verb) bring to an end; settle conclusively | Synonyms: decide, resolve, settle |
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| (verb) put on trial or hear a case and sit as the judge at the trial of | Synonyms: judge, try |
| adjudication | (noun) the final judgment in a legal proceeding; the act of pronouncing judgment based on the evidence presented | - |
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| adjudicative | (adjective) concerned with adjudicating | Synonyms: adjudicatory |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| adjudicatory | (adjective) concerned with adjudicating | Synonyms: adjudicative |
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| adrenergic | (adjective) relating to epinephrine (its release or action) | Synonyms: sympathomimetic |
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| (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
| adrenocortical | (adjective) of or derived from the cortex of the adrenal glands | - |
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| adrenocorticotrophic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotropic |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotrophic |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| adventuristic | (adjective) of or pertaining to adventurism | - |
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| advice | (noun) a proposal for an appropriate course of action | - |
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| adynamic | (adjective) characterized by an absence of force or forcefulness | Synonyms: undynamic |
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| (adjective) lacking energy or vitality | Synonyms: asthenic, debilitated, enervated |
| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aerolitic | (adjective) of or pertaining to certain stony meteorites | - |
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