| 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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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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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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| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| 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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| amine | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: aminoalkane |
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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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| 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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| 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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| 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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| ammonite | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonoid |
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| 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 | - |
| 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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| amniote | (noun) any member of the Amniota | - |
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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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| amoebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiasis |
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| amorousness | (noun) a feeling of love or fondness | Synonyms: enamoredness |
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| (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, eroticism, erotism, sexiness |
| amperage | (noun) the strength of an electrical current measured in amperes | - |
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| ampere | (noun) the basic unit of electric current adopted under the Systeme International d'Unites | Synonyms: A, amp |
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| (noun) a former unit of electric current (slightly smaller than the SI ampere) | Synonyms: international ampere |
| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
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| amphetamine | (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: pep pill, speed, upper |
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| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphisbaena | (noun) (classical mythology) a serpent with a head at each end of its body | - |
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| amphitheater | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheatre, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheatre |
| amphitheatre | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheater |
| ampholyte | (noun) A substance that acts as a base or an acid, depending on the pH of the solution into which it is introduced. | Synonyms: amphoteric electrolyte |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| ampleness | (noun) the property of impressive largeness in size | - |
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| (noun) the property of being more than sufficient; comfortable sufficiency | - |
| amplifier | (noun) electronic equipment that increases strength of signals passing through it | - |
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| amplitude | (noun) greatness of magnitude | - |
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| (noun) the property of copious abundance | Synonyms: bountifulness, bounty |
| (noun) (physics) the maximum displacement of a periodic wave | - |
| ampoule | (noun) a small bottle that contains a drug (especially a sealed sterile container for injection by needle) | Synonyms: ampul, ampule, phial, vial |
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| ampule | (noun) a small bottle that contains a drug (especially a sealed sterile container for injection by needle) | Synonyms: ampoule, ampul, phial, vial |
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| amputee | (noun) someone who has had a limb removed by amputation | - |
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| amrinone | (noun) a drug (trade name Inocor) used intravenously in heart failure; increases strength of contraction of myocardium | Synonyms: Inocor |
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| amulet | (noun) a trinket or piece of jewelry usually hung about the neck and thought to be a magical protection against evil or disease | Synonyms: talisman |
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| amusement | (noun) an activity that is diverting and that holds the attention | Synonyms: entertainment |
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| (noun) a feeling of delight at being entertained | - |
| amylase | (noun) any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar | - |
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| anaemia | (noun) a deficiency of red blood cells | Synonyms: anemia |
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| (noun) a lack of vitality | Synonyms: anemia |
| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| anaesthesia | (noun) loss of bodily sensation with or without loss of consciousness | Synonyms: anesthesia |
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| anaesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic agent, anesthetic, anesthetic agent |
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| anaesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anesthesiologist, anesthetist |
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| anagoge | (noun) a mystical or allegorical interpretation (especially of Scripture) | - |
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| analbuminemia | (noun) an abnormally low level of albumin in the blood serum | - |
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| analecta | (noun) a collection of excerpts from a literary work | Synonyms: analects |
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| analects | (noun) a collection of excerpts from a literary work | Synonyms: analecta |
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| analeptic | (noun) a medication used as a stimulant to the central nervous system | - |
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| analgesia | (noun) absence of the sense of pain without loss of consciousness | - |
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| analgesic | (noun) a medicine used to relieve pain | Synonyms: anodyne, pain pill, painkiller |
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| analogue | (noun) something having the property of being analogous to something else | Synonyms: analog, parallel |
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| analphabet | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabetic |
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| analphabetic | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
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| analphabetism | (noun) an inability to read | Synonyms: illiteracy |
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| analyser | (noun) an instrument that performs analyses | Synonyms: analyzer |
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| analyzer | (noun) an instrument that performs analyses | Synonyms: analyser |
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| anamnesis | (noun) the ability to recall past occurrences | Synonyms: recollection, remembrance |
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| (noun) the case history of a medical patient as recalled by the patient | Synonyms: medical history, medical record |
| anapaest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapest |
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| anapest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapaest |
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| anaphase | (noun) the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle | - |
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| anastrophe | (noun) the reversal of the normal order of words | Synonyms: inversion |
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| anathema | (noun) a formal ecclesiastical curse accompanied by excommunication | - |
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| (noun) a detested person | Synonyms: bete noire |
| anathematisation | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematization |
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