| amalgamator | (noun) a businessman who arranges an amalgamation of two or more commercial companies | - |
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| amatungulu | (noun) very large closely branched South African shrub having forked bright green spines and shiny leaves | Synonyms: Carissa grandiflora, Carissa macrocarpa, natal plum |
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| ambage | (noun) a style that involves indirect ways of expressing things | Synonyms: circumlocution, periphrasis |
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| ambages | (noun) (archaic) roundabout or mysterious ways of action | - |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| 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 | - |
| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| amigo | (noun) a friend or comrade | - |
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| amperage | (noun) the strength of an electrical current measured in amperes | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| 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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| anaglyph | (noun) anything carved in low relief | - |
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| (noun) moving or still pictures in contrasting colors that appear three-dimensional when superimposed | - |
| anaglyphy | (noun) the process of producing pictures in contrasting colors that appear three-dimensional when superimposed and viewed through spectacles with one red and one green lens | - |
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| anagnost | (noun) a cleric in the minor orders of the Eastern Orthodox Church who reads the lessons aloud in the liturgy (analogous to the lector in the Roman Catholic Church) | - |
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| anagoge | (noun) a mystical or allegorical interpretation (especially of Scripture) | - |
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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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| 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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| analog | (noun) something having the property of being analogous to something else | Synonyms: analogue, parallel |
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| analogist | (noun) someone who looks for analogies or who reasons by analogy | - |
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| analogue | (noun) something having the property of being analogous to something else | Synonyms: analog, parallel |
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| analogy | (noun) drawing a comparison in order to show a similarity in some respect | - |
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| (noun) an inference that if things agree in some respects they probably agree in others | - |
| (noun) the religious belief that between creature and creator no similarity can be found so great but that the dissimilarity is always greater; any analogy between God and humans will always be inadequate | Synonyms: doctrine of analogy |
| anastigmat | (noun) compound lens or lens system designed to be free of astigmatism and able to form approximately point images | - |
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| anchorage | (noun) the act of anchoring | - |
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| (noun) place for vessels to anchor | Synonyms: anchorage ground |
| (noun) a fee for anchoring | - |
| (noun) the condition of being secured to a base | - |
| (noun) the provision of a sense of security or steadfastness | - |
| androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
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| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
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| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| androgyne | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: epicene, epicene person, gynandromorph, hermaphrodite, intersex |
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| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
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| anemograph | (noun) An instrument which records wind velocities. | - |
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| anemography | (noun) recording anemometrical measurements | - |
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| anergy | (noun) reduction or lack of an immune response to a specific antigen | - |
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| (noun) inactivity and lack of energy | - |
| anesthesiologist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthetist |
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| anesthesiology | (noun) the branch of medical science that studies and applies anesthetics | - |
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| angel | (noun) spiritual being attendant upon God | - |
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| (noun) someone who provides financial support for some venture | Synonyms: backer |
| (noun) person of exceptional holiness | Synonyms: holy man, holy person, saint |
| angelfish | (noun) sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do | Synonyms: angel shark, monkfish, Squatina squatina |
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| (noun) a butterfly fish of the genus Pomacanthus | - |
| (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: Chaetodipterus faber, spadefish |
| angelica | (noun) aromatic stems or leaves or roots of Angelica Archangelica | - |
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| (noun) candied stalks of the angelica plant | - |
| (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelique |
| angelim | (noun) any of several tropical American trees of the genus Andira | Synonyms: andelmin |
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| angelique | (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelica |
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| angelology | (noun) the branch of theology that is concerned with angels | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| anger | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: ira, ire, wrath |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: choler, ire |
| (noun) the state of being angry | Synonyms: angriness |
| angiitis | (noun) inflammation of a blood vessel or lymph duct | - |
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| angina | (noun) any disease of the throat or fauces marked by spasmodic attacks of intense suffocative pain | - |
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| (noun) a heart condition marked by paroxysms of chest pain due to reduced oxygen to the heart | Synonyms: angina pectoris |
| 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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| angiocarp | (noun) tree bearing fruit enclosed in a shell or involucre or husk | - |
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| angioedema | (noun) recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs | Synonyms: atrophedema, giant hives, periodic edema, Quincke's edema |
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| angiogenesis | (noun) the formation of new blood vessels | - |
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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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| angiography | (noun) roentgenographic examination of blood vessels after injection of a radiopaque contrast medium; produces an angiogram | - |
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| angiohemophilia | (noun) a form of hemophilia discovered by Erik von Willebrand; a genetic disorder that is inherited as an autosomal recessive trait; characterized by a deficiency of the coagulation factor and by mucosal bleeding | Synonyms: vascular hemophilia, von Willebrand's disease |
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| angiologist | (noun) a physician who specializes in angiology | - |
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| angiology | (noun) the branch of medical science that studies the blood and lymph vessels and their disorders | - |
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| angioma | (noun) a tumor consisting of a mass of blood or lymphatic vessels | - |
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| angiopathy | (noun) any disease of the blood vessels or lymph ducts | - |
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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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| angiopteris | (noun) highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall | Synonyms: Angiopteris evecta, giant fern |
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| angiosarcoma | (noun) a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels | - |
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| angioscope | (noun) a modified microscope used to study capillary vessels | - |
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| angiosperm | (noun) plants having seeds in a closed ovary | Synonyms: flowering plant |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| angiotensin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotonin, Hypertensin |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| angle | (noun) a biased way of looking at or presenting something | Synonyms: slant |
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| (noun) the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians | - |
| angledozer | (noun) a bulldozer with an angled moldboard to push earth to one side | - |
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| angler | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| (noun) a fisherman who uses a hook and line | Synonyms: troller |
| (noun) a scheming person; someone who schemes to gain an advantage | - |
| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| anglewing | (noun) nymphalid butterfly having angular notches on the outer edges of the forewings | - |
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| angleworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler |
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| angling | (noun) fishing with a hook and line (and usually a pole) | - |
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| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anglophile | (noun) an admirer of England and things English | Synonyms: anglophil |
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| anglophobe | (noun) a person who hates England and everything English | - |
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| angostura | (noun) the bitter bark of a South American tree; used in medicines and liqueurs and bitters | Synonyms: angostura bark |
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| angrecum | (noun) any of various spectacular orchids of the genus Angraecum having dark green leathery leaves and usually nocturnally scented white or ivory flowers | - |
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| angriness | (noun) the state of being angry | Synonyms: anger |
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| angst | (noun) an acute but unspecific feeling of anxiety; usually reserved for philosophical anxiety about the world or about personal freedom | - |
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| angstrom | (noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation | Synonyms: A, angstrom unit |
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| anguish | (noun) extreme mental distress | Synonyms: torment, torture |
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| (noun) extreme distress of body or mind | - |
| angularity | (noun) the property possessed by a shape that has angles | - |
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| (noun) a shape having one or more sharp angles | Synonyms: angular shape |
| angulation | (noun) the act of making angulate (having corners) | - |
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| (noun) the precise measurement of angles | - |
| angwantibo | (noun) a kind of yellow or golden lemur (Arctocebus calabarensis) | Synonyms: Arctocebus calabarensis, golden potto |
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| anhinga | (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: darter, snakebird |
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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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| ankyloglossia | (noun) a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue | Synonyms: tongue tie |
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| anlage | (noun) an organ in its earliest stage of development; the foundation for subsequent development | Synonyms: primordium |
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| annealing | (noun) hardening something by heat treatment | Synonyms: tempering |
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| annotating | (noun) the act of adding notes | Synonyms: annotation |
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| annoying | (noun) the act of troubling or annoying someone | Synonyms: annoyance, irritation, vexation |
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| anointing | (noun) the act of applying oil or an oily liquid | Synonyms: anointment |
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| anorgasmia | (noun) absence of an orgasm in sexual relations | - |
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| anorthography | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, logagraphia |
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