| 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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| ampulla | (noun) a flask that has two handles; used by Romans for wines or oils | - |
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| (noun) the dilated portion of a canal or duct especially of the semicircular canals of the ear | - |
| amputation | (noun) a surgical removal of all or part of a limb | - |
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| (noun) a condition of disability resulting from the loss of one or more limbs | - |
| amputator | (noun) a surgeon who removes part or all of a limb | - |
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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 | - |
| amygdala | (noun) an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior | Synonyms: amygdaloid nucleus, corpus amygdaloideum |
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| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| amygdaloid | (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyl | (noun) a hydrocarbon radical that occurs in many organic compounds | - |
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| 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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| amyloid | (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
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| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| amyloidosis | (noun) a disorder characterized by deposit of amyloid in organs or tissues; often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma | - |
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| amylolysis | (noun) conversion of starch to sugar | - |
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| amylum | (noun) a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles | Synonyms: starch |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| amyotrophia | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophy |
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| amyotrophy | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophia |
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| amyxia | (noun) a condition in which no mucus in produced | - |
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| anagram | (noun) a word or phrase spelled by rearranging the letters of another word or phrase | - |
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| anagrams | (noun) a game whose object is to form words from a group of randomly chosen letters | - |
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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 |
| anamorphism | (noun) a distorted projection or perspective; especially an image distorted in such a way that it becomes visible only when viewed in a special manner | Synonyms: anamorphosis |
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| (noun) metamorphism that occurs deep under the earth's surface; changes simple minerals into complex minerals | - |
| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphosis |
| anamorphosis | (noun) a distorted projection or perspective; especially an image distorted in such a way that it becomes visible only when viewed in a special manner | Synonyms: anamorphism |
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| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphism |
| angiocardiogram | (noun) a series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substance | - |
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| angiogram | (noun) an X-ray representation of blood vessels made after the injection of a radiopaque substance | - |
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| anisogamete | (noun) either of a pair of unlike gametes especially those unlike in size | - |
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| anisogamy | (noun) (biology) reproduction by the union or fusion of two differing gametes (especially differing in size) | - |
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| antechamber | (noun) a large entrance or reception room or area | Synonyms: anteroom, entrance hall, foyer, hall, lobby, vestibule |
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| antigram | (noun) an anagram that means the opposite of the original word or phrase | - |
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| antihistamine | (noun) a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site | - |
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| apishamore | (noun) a saddle blanket made of buffalo hide | - |
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| apogamy | (noun) (botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization | - |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| arame | (noun) an edible seaweed with a mild flavor | - |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arthrogram | (noun) an X ray of a joint after the injection of a contrast medium | - |
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| ashram | (noun) (India) a place of religious retreat for Hindus | - |
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| (noun) a place of religious retreat modeled after the Indian ashram | - |
| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| autogamy | (noun) self-fertilization in plants | - |
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| avaram | (noun) evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning; sometimes placed in genus Cassia | Synonyms: Cassia auriculata, Senna auriculata, tanner's cassia |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| babygram | (noun) an X-ray of the entire body of an infant. | - |
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| backgammon | (noun) a board game for two players; pieces move according to throws of the dice | - |
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| ballgame | (noun) a field game played with a ball (especially baseball) | Synonyms: ball game |
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| (noun) a particular situation that is radically different from the preceding situation | Synonyms: new ballgame |
| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| balsam | (noun) an ointment containing a fragrant resin | - |
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| (noun) any seed plant yielding balsam | - |
| (noun) any of various fragrant oleoresins used in medicines and perfumes | - |
| balsamroot | (noun) a plant of the genus Balsamorhiza having downy leaves in a basal rosette and yellow flowers and long balsam-scented taproots | - |
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| bam | (noun) a sudden very loud noise | Synonyms: bang, blast, clap, eruption |
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| bambino | (noun) a young child who is just beginning to walk | Synonyms: toddler, tot, yearling |
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| bamboo | (noun) woody tropical grass having hollow woody stems; mature canes used for construction and furniture | - |
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| (noun) the hard woody stems of bamboo plants; used in construction and crafts and fishing poles | - |
| bantam | (noun) any of various small breeds of fowl | - |
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| bantamweight | (noun) A weight class division in combat sports, for fighters heavier than those in the flyweight division and lighter than those in the featherweight division. | - |
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| (noun) an amateur boxer who weighs no more than 119 pounds | - |
| (noun) weighs 115-126 pounds | - |
| 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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| beam | (noun) long thick piece of wood or metal or concrete, etc., used in construction | - |
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| (noun) a gymnastic apparatus used by women gymnasts | Synonyms: balance beam |
| (noun) the broad side of a ship | - |
| (noun) (nautical) breadth amidships | - |
| (noun) a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather | Synonyms: radio beam |
| (noun) a column of light (as from a beacon) | Synonyms: beam of light, irradiation, light beam, ray, ray of light, shaft, shaft of light |
| (noun) a group of nearly parallel lines of electromagnetic radiation | Synonyms: electron beam, ray |
| bechamel | (noun) milk thickened with a butter and flour roux | Synonyms: bechamel sauce, white sauce |
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| bedchamber | (noun) a room used primarily for sleeping | Synonyms: bedroom, chamber, sleeping accommodation, sleeping room |
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| bedframe | (noun) the framework of a bed | Synonyms: bedstead |
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| bedlam | (noun) a state of extreme confusion and disorder | Synonyms: chaos, pandemonium, topsy-turvydom, topsy-turvyness |
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| bedlamite | (noun) an archaic term for a lunatic | - |
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| beldam | (noun) a woman of advanced age | Synonyms: beldame |
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| (noun) an ugly evil-looking old woman | Synonyms: beldame, crone, hag, witch |
| beldame | (noun) a woman of advanced age | Synonyms: beldam |
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| (noun) an ugly evil-looking old woman | Synonyms: beldam, crone, hag, witch |
| benjamin | (noun) gum resin used especially in treating skin irritation | Synonyms: asa dulcis, benzoin, gum benjamin, gum benzoin |
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| bergamot | (noun) small tree with pear-shaped fruit whose oil is used in perfumery; Italy | Synonyms: bergamot orange, Citrus bergamia |
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| bigamist | (noun) someone who marries one person while already legally married to another | - |
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| bigamy | (noun) the offense of marrying someone while you have a living spouse from whom no valid divorce has occurred | - |
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| (noun) the state of having two spouses at the same time | - |
| bigram | (noun) a word that is written with two letters in an alphabetic writing system | - |
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| biodynamics | (noun) the branch of biology dealing with energy or the activity of living organisms. | - |
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| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blame | (noun) a reproach for some lapse or misdeed | Synonyms: rap |
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| (noun) an accusation that you are responsible for some lapse or misdeed | Synonyms: incrimination, inculpation |
| blamelessness | (noun) a state of innocence | Synonyms: guiltlessness, inculpability, inculpableness |
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| blameworthiness | (noun) a state of guilt | Synonyms: culpability, culpableness |
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| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| blowlamp | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowtorch, torch |
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| bologram | (noun) record or recording made by a bolometer | Synonyms: bolograph |
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| bramble | (noun) any of various rough thorny shrubs or vines | - |
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| brambling | (noun) Eurasian finch | Synonyms: Fringilla montifringilla |
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| bream | (noun) any of various usually edible freshwater percoid fishes having compressed bodies and shiny scales; especially (but not exclusively) of the genus Lepomis | Synonyms: freshwater bream |
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| (noun) any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae | Synonyms: sea bream |
| (noun) flesh of any of various saltwater fishes of the family Sparidae or the family Bramidae | Synonyms: sea bream |
| (noun) flesh of various freshwater fishes of North America or of Europe | Synonyms: freshwater bream |
| brougham | (noun) a sedan that has no roof over the driver's seat | - |
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| (noun) light carriage; pulled by a single horse | - |
| buckram | (noun) a coarse cotton fabric stiffened with glue; used in bookbinding and to stiffen clothing | - |
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| byname | (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: cognomen, moniker, nickname, sobriquet, soubriquet |
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| cablegram | (noun) a telegram sent abroad | Synonyms: cable, overseas telegram |
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| calamari | (noun) (Italian cuisine) squid prepared as food | Synonyms: calamary, squid |
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| calamary | (noun) (Italian cuisine) squid prepared as food | Synonyms: calamari, squid |
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| calamine | (noun) a white mineral; a common ore of zinc | Synonyms: hemimorphite |
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| calamint | (noun) perennial aromatic herbs growing in hedgerows or scrub or open woodlands from western Europe to central Asia and in North America | - |
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| calamity | (noun) an event resulting in great loss and misfortune | Synonyms: cataclysm, catastrophe, disaster, tragedy |
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| calamondin | (noun) a fruit of the calamondin tree. | - |
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| calamus | (noun) the hollow spine of a feather | Synonyms: quill, shaft |
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| (noun) any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes | - |
| (noun) perennial marsh plant having swordlike leaves and aromatic roots | Synonyms: Acorus calamus, flagroot, myrtle flag, sweet calamus, sweet flag |
| (noun) the aromatic root of the sweet flag used medicinally | - |
| cam | (noun) a rotating disk shaped to convert circular into linear motion | - |
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