| abidance | (noun) the act of abiding (enduring without yielding) | - |
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| (noun) the act of dwelling in a place | Synonyms: residence, residency |
| (noun) acting according to certain accepted standards | Synonyms: compliance, conformation, conformity |
| abide | (verb) put up with something or somebody unpleasant | Synonyms: bear, brook, digest, endure, put up, stand, stick out, stomach, suffer, support, tolerate |
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| (verb) dwell | Synonyms: bide, stay |
| abiding | (adjective) lasting a long time | Synonyms: enduring, imperishable |
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| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| abridge | (verb) reduce in scope while retaining essential elements | Synonyms: abbreviate, contract, cut, foreshorten, reduce, shorten |
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| (verb) lessen, diminish, or curtail | - |
| abridged | (adjective) (used of texts) shortened by condensing or rewriting | - |
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| abridgement | (noun) a shortened version of a written work | Synonyms: abridgment, capsule, condensation |
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| abridger | (noun) one who shortens or abridges or condenses a written work | Synonyms: abbreviator |
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| abridgment | (noun) a shortened version of a written work | Synonyms: abridgement, capsule, condensation |
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| acanthoid | (adjective) shaped like a spine or thorn | Synonyms: acanthous, spinous |
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| acaracide | (noun) a chemical agent used to kill mites | Synonyms: acaricide |
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| acaricide | (noun) a chemical agent used to kill mites | Synonyms: acaracide |
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| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| accidence | (noun) the part of grammar that deals with the inflections of words | Synonyms: inflectional morphology |
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| accident | (noun) anything that happens suddenly or by chance without an apparent cause | Synonyms: chance event, fortuity, stroke |
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| (noun) an unfortunate mishap; especially one causing damage or injury | - |
| accidental | (adjective) not of prime or central importance | Synonyms: incidental, nonessential |
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| (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: inadvertent |
| (noun) a musical notation that makes a note sharp or flat or natural although that is not part of the key signature | - |
| accidentally | (adverb) without advance planning | Synonyms: by chance, circumstantially, unexpectedly |
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| (adverb) without intention; in an unintentional manner | Synonyms: unintentionally |
| (adverb) of a minor or subordinate nature | Synonyms: incidentally |
| accroides | (noun) an alcohol-soluble resin from Australian trees; used in varnishes and in manufacturing paper | Synonyms: acaroid resin, accaroid resin, accroides gum, accroides resin, gum accroides |
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| acetamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: ethanamide |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acid | (adjective) having the characteristics of an acid | - |
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| (adjective) being sour to the taste | Synonyms: acidic, acidulent, acidulous |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| (noun) street name for lysergic acid diethylamide | Synonyms: back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen |
| (noun) any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt | - |
| acidemia | (noun) a blood disorder characterized by an increased concentration of hydrogen ions in the blood (which falls below 7 on the pH scale) | - |
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| acidic | (adjective) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) | - |
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| (adjective) being sour to the taste | Synonyms: acid, acidulent, acidulous |
| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidify | (verb) turn acidic | Synonyms: acetify |
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| (verb) make sour or more sour | Synonyms: acetify, acidulate, sour |
| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acidosis | (noun) abnormally high acidity (excess hydrogen-ion concentration) of the blood and other body tissues | - |
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| acidotic | (adjective) having or being characterized by acidosis | - |
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| acidulate | (verb) make sour or more sour | Synonyms: acetify, acidify, sour |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulous | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulent |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acrid | (adjective) strong and sharp | Synonyms: pungent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| acridness | (noun) extreme bitterness | Synonyms: acridity |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridity |
| acrylamide | (noun) a white crystalline amide of propenoic acid can damage the nervous system and is carcinogenic in laboratory animals | - |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinoid | (adjective) having a radial form | - |
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| (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| adenoid | (adjective) relating to or resembling lymphatic glands or lymphoid tissue | - |
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| (noun) a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx) | Synonyms: Luschka's tonsil, pharyngeal tonsil, third tonsil, tonsilla adenoidea, tonsilla pharyngealis |
| adenoidal | (adjective) of or pertaining to the adenoids | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: nasal, pinched |
| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| aforesaid | (adjective) being the one previously mentioned or spoken of | Synonyms: aforementioned, said |
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| afraid | (adjective) filled with fear or apprehension | - |
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| (adjective) filled with regret or concern; used often to soften an unpleasant statement | - |
| (adjective) having feelings of aversion or unwillingness | - |
| (adjective) feeling worry or concern or insecurity | - |
| agamid | (noun) a lizard of the family Agamidae | Synonyms: agamid lizard |
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| aid | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assist, assistance, help |
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| (noun) the work of providing treatment for or attending to someone or something | Synonyms: attention, care, tending |
| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: assistance, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: assistance, economic aid, economic assistance, financial aid, financial assistance |
| (verb) improve the condition of | Synonyms: help |
| (verb) give help or assistance; be of service | Synonyms: assist, help |
| aide | (noun) someone who acts as assistant | Synonyms: auxiliary |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: adjutant, aide-de-camp |
| aided | (adjective) having help; often used as a combining form | Synonyms: assisted |
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| aikido | (noun) a Japanese martial art employing principles similar to judo | - |
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| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
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| algid | (adjective) chilly | - |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algoid | (adjective) of or resembling algae | - |
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| alidad | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidade |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidade |
| alidade | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidad |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidad |
| alkaloid | (noun) natural bases containing nitrogen found in plants | - |
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| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| allantoid | (adjective) shaped like a sausage | Synonyms: sausage-shaped |
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| alongside | (adverb) side by side | Synonyms: aboard |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| ameboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: amoeboid |
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| 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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| amidship | (adjective) located in the middle part of a ship or aircraft | - |
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| (adverb) at or near or toward the center of a ship | Synonyms: amidships, midships |
| (adverb) at or near or toward the middle | - |
| amidships | (adverb) at or near or toward the center of a ship | Synonyms: amidship, midships |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| amoeboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: ameboid |
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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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| amygdaloid | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloidal |
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| (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amyloid | (adjective) resembling starch | Synonyms: amylaceous, amyloidal, farinaceous, starchlike |
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| (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| 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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| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
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| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
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| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
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| (noun) An operating system from Google for mobile devices | - |
| aneroid | (adjective) containing no liquid or actuated without the use of liquid | - |
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| (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
| aneuploid | (adjective) having a chromosome number that is not an exact multiple of the haploid number | - |
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