| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambience | (noun) the atmosphere of an environment | Synonyms: ambiance |
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| (noun) a particular environment or surrounding influence | Synonyms: ambiance, atmosphere |
| ambiguity | (noun) unclearness by virtue of having more than one meaning | Synonyms: equivocalness |
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| (noun) an expression whose meaning cannot be determined from its context | - |
| ambit | (noun) an area in which something acts or operates or has power or control: | Synonyms: compass, orbit, range, reach, scope |
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| ambition | (noun) a strong drive for success | Synonyms: ambitiousness |
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| (noun) a cherished desire | Synonyms: aspiration, dream |
| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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| ambivalence | (noun) mixed feelings or emotions | Synonyms: ambivalency |
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| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| amble | (noun) a leisurely walk (usually in some public place) | Synonyms: perambulation, promenade, saunter, stroll |
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| ambler | (noun) someone who walks at a leisurely pace | Synonyms: saunterer, stroller |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| ambo | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: dais, podium, pulpit, rostrum, soapbox, stump |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| ambrosia | (noun) (classical mythology) the food and drink of the gods; mortals who ate it became immortal | Synonyms: nectar |
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| (noun) fruit dessert made of oranges and bananas with shredded coconut | - |
| (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: bitterweed, ragweed |
| (noun) a mixture of nectar and pollen prepared by worker bees and fed to larvae | Synonyms: beebread |
| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| ambulation | (noun) walking about | - |
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| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| ambush | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambuscade, lying in wait, trap |
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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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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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| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| amebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amoebiasis, amoebiosis |
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| ameer | (noun) an independent ruler or chieftain (especially in Africa or Arabia) | Synonyms: amir, emeer, emir |
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| amelia | (noun) congenital absence of an arm or leg | - |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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| amenableness | (noun) the trait of being cooperative | Synonyms: amenability, cooperativeness |
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| amendment | (noun) the act of amending or correcting | - |
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| (noun) a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) | - |
| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| amenia | (noun) absence or suppression of normal menstrual flow | Synonyms: amenorrhea, amenorrhoea |
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| amenities | (noun) things that make you comfortable and at ease | Synonyms: comforts, conveniences, creature comforts |
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| amenity | (noun) pleasantness resulting from agreeable conditions | Synonyms: agreeableness |
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| amenorrhea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhoea |
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| amenorrhoea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhea |
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| ament | (noun) a cylindrical spikelike inflorescence | Synonyms: catkin |
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| amentia | (noun) extreme mental retardation | Synonyms: idiocy |
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| amercement | (noun) money extracted as a penalty | Synonyms: fine, mulct |
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| americium | (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms | Synonyms: Am, atomic number 95 |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| amethyst | (noun) a transparent purple variety of quartz; used as a gemstone | - |
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| ametria | (noun) congenital absence of the uterus | - |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| amide | (noun) any organic compound containing the group -CONH2 | - |
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| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| amigo | (noun) a friend or comrade | - |
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| amine | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: aminoalkane |
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| amino | (noun) the radical -NH2 | Synonyms: amino group |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| aminoalkane | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: amine |
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| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| amir | (noun) an independent ruler or chieftain (especially in Africa or Arabia) | Synonyms: ameer, emeer, emir |
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| amitosis | (noun) the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes | - |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| amity | (noun) a cordial disposition | Synonyms: cordiality |
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| (noun) a state of friendship and cordiality | - |
| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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| ammine | (noun) a complex inorganic compound that contains ammonia molecules | - |
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| ammo | (noun) projectiles to be fired from a gun | Synonyms: ammunition |
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| ammobium | (noun) any plant of the genus Ammobium having yellow flowers and silvery foliage | - |
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| ammonal | (noun) Ammonal is an explosive made up of ammonium nitrate and aluminum powder. | - |
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| ammonia | (noun) a pungent gas compounded of nitrogen and hydrogen (NH3) | - |
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| (noun) a water solution of ammonia | Synonyms: ammonia water, ammonium hydroxide |
| ammoniac | (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| ammonite | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonoid |
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| ammonium | (noun) the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion | Synonyms: ammonium ion |
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| ammoniuria | (noun) excessive ammonia in the urine | - |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| ammunition | (noun) projectiles to be fired from a gun | Synonyms: ammo |
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| (noun) information that can be used to attack or defend a claim or argument or viewpoint | - |
| (noun) any nuclear or chemical or biological material that can be used as a weapon of mass destruction | - |
| amnesia | (noun) partial or total loss of memory | Synonyms: blackout, memory loss |
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| amnesiac | (noun) a person suffering from amnesia | Synonyms: amnesic |
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| amnesic | (noun) a person suffering from amnesia | Synonyms: amnesiac |
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| amnesty | (noun) the formal act of liberating someone | Synonyms: free pardon, pardon |
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| (noun) a warrant granting release from punishment for an offense | Synonyms: pardon |
| (noun) a period during which offenders are exempt from punishment | - |
| amnio | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amniocentesis |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| amnion | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnios, amniotic sac |
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| amnios | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnion, amniotic sac |
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| amniote | (noun) any member of the Amniota | - |
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| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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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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| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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