| academic | (noun) an educator who works at a college or university | Synonyms: academician, faculty member |
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| acatalectic | (noun) (prosody) a line of verse that has the full number of syllables | - |
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| acoustic | (noun) a remedy for hearing loss or deafness | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| acrylic | (noun) a synthetic fabric made from polyacrylonitrile | - |
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| (noun) used especially by artists | Synonyms: acrylic paint |
| (noun) a glassy thermoplastic; can be cast and molded or used in coatings and adhesives | Synonyms: acrylate resin, acrylic resin |
| (noun) polymerized from acrylonitrile | Synonyms: acrylic fiber |
| adrenergic | (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
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| aesthetic | (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
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| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agnostic | (noun) a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) | - |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: doubter |
| alcoholic | (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |
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| alembic | (noun) an obsolete kind of container used for distillation; two retorts connected by a tube | - |
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| alexic | (noun) a person with alexia | - |
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| almanac | (noun) an annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year | - |
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| (noun) an annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given year | Synonyms: farmer's calendar |
| ammoniac | (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
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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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| anaesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic agent, anesthetic, anesthetic agent |
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| analeptic | (noun) a medication used as a stimulant to the central nervous system | - |
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| analgesic | (noun) a medicine used to relieve pain | Synonyms: anodyne, pain pill, painkiller |
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| analphabetic | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
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| anesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic, anaesthetic agent, anesthetic agent |
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| anionic | (noun) a class of synthetic detergents in which the molecules do not ionize in aqueous solutions | Synonyms: anionic detergent, non-ionic detergent |
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| anorectic | (noun) a person suffering from anorexia nervosa | Synonyms: anorexic |
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| anorexic | (noun) a person suffering from anorexia nervosa | Synonyms: anorectic |
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| anthelminthic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
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| anthelmintic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
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| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antibiotic | (noun) a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections | Synonyms: antibiotic drug |
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| antic | (noun) a ludicrous or grotesque act done for fun and amusement | Synonyms: caper, joke, prank, put-on, trick |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antiemetic | (noun) a drug that prevents or alleviates nausea and vomiting | Synonyms: antiemetic drug |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antimicrobic | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
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| antimycotic | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic agent, fungicide |
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| antineoplastic | (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| antipyretic | (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
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| antiseptic | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| anxiolytic | (noun) a tranquilizer used to relieve anxiety and reduce tension and irritability | Synonyms: antianxiety drug, anxiolytic drug, minor tranquilizer, minor tranquilliser, minor tranquillizer |
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| aphakic | (noun) someone afflicted by aphakia; someone lacking the natural lenses of the eyes | - |
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| aphasic | (noun) someone affected by aphasia or inability to use or understand language | - |
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| aphrodisiac | (noun) a drug or other agent that stimulates sexual desire | - |
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| aquatic | (noun) a plant that lives in or on water | - |
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| arc | (noun) electrical conduction through a gas in an applied electric field | Synonyms: discharge, electric arc, electric discharge, spark |
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| (noun) a continuous portion of a circle | - |
| (noun) something curved in shape | Synonyms: bow |
| archbishopric | (noun) the territorial jurisdiction of an archbishop | - |
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| arcsec | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsecant, inverse secant |
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| arctic | (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arthritic | (noun) a person afflicted with arthritis | - |
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| ascetic | (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
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| asdic | (noun) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return | Synonyms: echo sounder, sonar |
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| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| asthmatic | (noun) a person suffering from asthma | - |
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| ataractic | (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
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| attic | (noun) floor consisting of open space at the top of a house just below roof; often used for storage | Synonyms: garret, loft |
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| (noun) (architecture) a low wall at the top of the entablature; hides the roof | - |
| (noun) informal terms for a human head | Synonyms: bean, bonce, dome, noggin, noodle |
| automatic | (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
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| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |
| baldric | (noun) a wide (ornamented) belt worn over the right shoulder to support a sword or bugle by the left hip | Synonyms: baldrick |
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| basic | (noun) (usually in the plural) a necessary commodity for which demand is constant | Synonyms: staple |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| biquadratic | (noun) a polynomial of the fourth degree | Synonyms: biquadratic polynomial, quartic polynomial |
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| (noun) an equation of the fourth degree | Synonyms: biquadratic equation |
| (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, fourth power, quartic |
| bishopric | (noun) the territorial jurisdiction of a bishop | Synonyms: diocese, episcopate |
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| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| bivouac | (noun) temporary living quarters specially built by the army for soldiers | Synonyms: camp, cantonment, encampment |
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| (noun) a site where people on holiday can pitch a tent | Synonyms: campground, camping area, camping ground, camping site, campsite, encampment |
| blanc | (noun) a white sauce of fat, broth, and vegetables (used especially with braised meat) | - |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| bloc | (noun) a group of countries in special alliance | Synonyms: axis |
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| bonduc | (noun) tropical tree with large prickly pods of seeds that resemble beans and are used for jewelry and rosaries | Synonyms: bonduc tree, Caesalpinia bonduc, Caesalpinia bonducella |
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| (noun) handsome tree of central and eastern North America having large bipinnate leaves and green-white flowers followed by large woody brown pods whose seeds are used as a coffee substitute | Synonyms: chicot, Gymnocladus dioica, Kentucky coffee tree |
| bosc | (noun) greenish-yellow pear | - |
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| brachycephalic | (noun) an adult with a short broad head | - |
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| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| bronc | (noun) an unbroken or imperfectly broken mustang | Synonyms: broncho, bronco |
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| bucolic | (noun) a short poem descriptive of rural or pastoral life | Synonyms: eclogue, idyl, idyll |
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| (noun) a country person | Synonyms: peasant, provincial |
| bulimic | (noun) a person suffering from bulimia | - |
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| c | (noun) the 3rd letter of the Roman alphabet | Synonyms: C |
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| (noun) the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second | Synonyms: light speed, speed of light |
| calpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpack, kalpac |
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| cambric | (noun) a finely woven white linen | - |
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| caoutchouc | (noun) an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products | Synonyms: gum elastic, India rubber, natural rubber, rubber |
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| catacaustic | (noun) a caustic curve formed by light reflecting from a curved surface. | - |
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| catalectic | (noun) (prosody) a line of verse that lacks a syllable in the last metrical foot | - |
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| cataleptic | (noun) a person suffering from catalepsy | - |
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| cathartic | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: aperient, physic, purgative |
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| caustic | (noun) the envelope of light rays reflected or refracted by a curved surface or object | - |
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| (noun) any chemical substance that burns or destroys living tissue | - |
| cc | (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cubic centimeter, cubic centimetre, mil, milliliter, millilitre, ml |
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| celeriac | (noun) thickened edible aromatic root of a variety of celery plant | Synonyms: celery root |
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| (noun) grown for its thickened edible aromatic root | Synonyms: Apium graveolens rapaceum, celery root, knob celery, root celery, turnip-rooted celery |
| cellulosic | (noun) a plastic made from cellulose (or a derivative of cellulose) | - |
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| ceramic | (noun) an artifact made of hard brittle material produced from nonmetallic minerals by firing at high temperatures | - |
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| charabanc | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| characteristic | (noun) a distinguishing quality; a feature that can be used to identify something | - |
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| (noun) any measurable property of a device measured under closely specified conditions | Synonyms: device characteristic |
| (noun) a prominent attribute or aspect of something | Synonyms: feature |
| (noun) the integer part (positive or negative) of the representation of a logarithm; in the expression log 643 = 2.808 the characteristic is 2 | - |
| chic | (noun) elegance by virtue of being fashionable | Synonyms: chichi, chicness, last word, modishness, smartness, stylishness, swank |
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| chiropractic | (noun) a method of treatment that manipulates body structures (especially the spine) to relieve low back pain or even headache or high blood pressure | - |
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| choc | (noun) colloquial British abbreviation | - |
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| classic | (noun) a creation of the highest excellence | - |
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| (noun) an artist who has created classic works | - |
| cleric | (noun) a clergyman or other person in religious orders | Synonyms: churchman, divine, ecclesiastic |
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| climacteric | (noun) the time in a woman's life in which the menstrual cycle ends | Synonyms: change of life, menopause |
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| (noun) a period in a man's life corresponding to menopause | - |