| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| afghan | (noun) a blanket knitted or crocheted in strips or squares; sometimes used as a shawl | - |
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| (noun) a coat made of sheepskin | Synonyms: sheepskin coat |
| afghani | (noun) the basic unit of money in Afghanistan | - |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| aftermath | (noun) the outcome of an event especially as relative to an individual | Synonyms: consequence |
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| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: backwash, wake |
| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| ahem | (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: hem |
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| ahimsa | (noun) a Buddhist and Hindu and especially Jainist doctrine holding that all forms of life are sacred and urging the avoidance of violence | - |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airworthiness | (noun) fitness to fly | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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| alchemist | (noun) one who was versed in the practice of alchemy and who sought an elixir of life and a panacea and an alkahest and the philosopher's stone | - |
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| alchemy | (noun) a pseudoscientific forerunner of chemistry in medieval times | - |
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| (noun) the way two individuals relate to each other | Synonyms: chemistry, interpersonal chemistry |
| alcohol | (noun) a liquor or brew containing alcohol as the active agent | Synonyms: alcoholic beverage, alcoholic drink, inebriant, intoxicant |
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| (noun) any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation | - |
| alcoholic | (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |
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| alcoholism | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: dipsomania, potomania |
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| (noun) habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms | Synonyms: alcohol addiction, drunkenness, inebriation |
| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
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| alehoof | (noun) trailing European aromatic plant of the mint family having rounded leaves and small purplish flowers often grown in hanging baskets; naturalized in North America; sometimes placed in genus Nepeta | Synonyms: field balm, gill-over-the-ground, Glechoma hederaceae, ground ivy, Nepeta hederaceae, runaway robin |
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| alehouse | (noun) a tavern where ale is sold | - |
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| aleph | (noun) the 1st letter of the Hebrew alphabet | - |
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| algophilia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algolagnia |
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| algophobia | (noun) a morbid fear of pain | - |
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| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| alhamdulilah | (noun) An expression meaning 'praise God' in Arabic | - |
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| aliyah | (noun) (Judaism) immigration of Jews to Israel | - |
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| (noun) (Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah | - |
| alkahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alcahest, universal solvent |
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| allelomorph | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allele |
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| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| allmouth | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: angler, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| allograph | (noun) a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme | - |
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| (noun) a signature written by one person for another | - |
| allomorph | (noun) a variant phonological representation of a morpheme | - |
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| (noun) any of several different crystalline forms of the same chemical compound | - |
| allopathy | (noun) the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| aloha | (noun) an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian) | Synonyms: ciao |
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| alpha | (noun) the 1st letter of the Greek alphabet | - |
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| (noun) the beginning of a series or sequence | - |
| alphabet | (noun) the elementary stages of any subject (usually plural) | Synonyms: first principles, rudiments |
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| (noun) a character set that includes letters and is used to write a language | Synonyms: ABC's, ABC, ABCs |
| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| althea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, hollyhock |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| amah | (noun) a female domestic | Synonyms: housemaid, maid, maidservant |
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| (noun) a woman hired to suckle a child of someone else | Synonyms: wet-nurse, wet nurse, wetnurse |
| amaranth | (noun) any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food | - |
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| (noun) seed of amaranth plants used as a native cereal in Central and South America | - |
| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| ambassadorship | (noun) the post of ambassador | - |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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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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| 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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| 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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| 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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| amorpha | (noun) any plant of the genus Amorpha having odd-pinnate leaves and purplish spicate flowers | - |
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| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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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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| amphibia | (noun) the class of vertebrates that live on land but breed in water, frogs, toads, newts, salamanders, caecilians | Synonyms: class Amphibia |
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| amphibian | (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
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| (noun) an airplane designed to take off and land on water | Synonyms: amphibious aircraft |
| (noun) a flat-bottomed motor vehicle that can travel on land or water | Synonyms: amphibious vehicle |
| 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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| 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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| amphiboly | (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: amphibology |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amphipod | (noun) a kind of malacostracan crustacean | - |
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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 |
| amphiuma | (noun) aquatic eel-shaped salamander having two pairs of very small feet; of still muddy waters in the southern United States | Synonyms: blind eel, congo eel, congo snake |
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| 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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| amphora | (noun) an ancient jar with two handles and a narrow neck; used to hold oil or wine | - |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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