| abode | (noun) housing that someone is living in | Synonyms: domicile, dwelling, dwelling house, habitation, home |
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| (noun) any address at which you dwell more than temporarily | Synonyms: residence |
| 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 |
| abrader | (noun) a tool or machine used for wearing down or smoothing or polishing | Synonyms: abradant |
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| absconder | (noun) a fugitive who runs away and hides to avoid arrest or prosecution | - |
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| absentmindedness | (noun) preoccupation so great that the ordinary demands on attention are ignored | - |
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| academe | (noun) the academic world | Synonyms: academia |
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| academia | (noun) the academic world | Synonyms: academe |
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| academic | (noun) an educator who works at a college or university | Synonyms: academician, faculty member |
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| academician | (noun) an educator who works at a college or university | Synonyms: academic, faculty member |
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| (noun) a scholar who is skilled in academic disputation | Synonyms: schoolman |
| (noun) someone elected to honorary membership in an academy | - |
| academicianship | (noun) the position of member of an honorary academy | - |
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| academicism | (noun) orthodoxy of a scholastic variety | Synonyms: academism, scholasticism |
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| (noun) Purely speculative thoughts and attitudes. | - |
| (noun) a style of painting and sculpture produced under the influence of European academies of art. | Synonyms: academic art, academism |
| academism | (noun) orthodoxy of a scholastic variety | Synonyms: academicism, scholasticism |
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| (noun) a style of painting and sculpture produced under the influence of European academies of art. | Synonyms: academic art, academicism |
| academy | (noun) a learned establishment for the advancement of knowledge | - |
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| (noun) a secondary school (usually private) | - |
| (noun) a school for special training | - |
| (noun) an institution for the advancement of art or science or literature | Synonyms: honorary society |
| 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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| 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 | (noun) a musical notation that makes a note sharp or flat or natural although that is not part of the key signature | - |
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| accolade | (noun) a tangible symbol signifying approval or distinction | Synonyms: award, honor, honour, laurels |
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| 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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| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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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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| 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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| 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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| 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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| addend | (noun) a number that is added to another number (the augend) | - |
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| addendum | (noun) textual matter that is added onto a publication; usually at the end | Synonyms: postscript, supplement |
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| adder | (noun) small terrestrial viper common in northern Eurasia | Synonyms: common viper, Vipera berus |
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| (noun) a machine that adds numbers | - |
| (noun) a person who adds numbers | - |
| ade | (noun) a sweetened beverage of diluted fruit juice | Synonyms: fruit drink |
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| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| adenine | (noun) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA | Synonyms: A |
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| adenitis | (noun) inflammation of a gland or lymph node | - |
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| adenocarcinoma | (noun) malignant tumor originating in glandular epithelium | Synonyms: glandular cancer, glandular carcinoma |
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| adenohypophysis | (noun) the anterior lobe of the pituitary body; primarily glandular in nature | Synonyms: anterior pituitary, anterior pituitary gland |
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| adenoid | (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 |
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| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adenoma | (noun) a benign epithelial tumor of glandular origin | - |
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| adenomegaly | (noun) gland enlargement | - |
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| adenomyosarcoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: embryoma of the kidney, nephroblastoma, Wilms' tumor, Wilms tumour |
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| adenomyosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: endometriosis |
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| adenopathy | (noun) a glandular disease or enlargement of glandular tissue (especially of the lymph glands) | - |
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| adenosine | (noun) (biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constituent of DNA and RNA and ADP and ATP and AMP | - |
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| adenosis | (noun) a disorder of the glands of the body | Synonyms: gland disease, glandular disease, glandular disorder |
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| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| adept | (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
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| adeptness | (noun) skillful performance or ability without difficulty | Synonyms: adroitness, deftness, facility, quickness |
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| adequacy | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequateness |
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| (noun) the quality of being sufficient for the end in view | Synonyms: sufficiency |
| adequateness | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequacy |
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| adermin | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: pyridoxal, pyridoxamine, pyridoxine, vitamin B6 |
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| adesite | (noun) dark greyish extrusive rock | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| afterdeck | (noun) a deck abaft of midships | - |
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| 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 |
| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
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| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| alder | (noun) north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant | Synonyms: alder tree |
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| (noun) wood of any of various alder trees; resistant to underwater rot; used for bridges etc | - |
| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
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| 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 |
| allemande | (noun) egg-thickened veloute | Synonyms: allemande sauce |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| amide | (noun) any organic compound containing the group -CONH2 | - |
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| amplitude | (noun) greatness of magnitude | - |
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| (noun) the property of copious abundance | Synonyms: bountifulness, bounty |
| (noun) (physics) the maximum displacement of a periodic wave | - |
| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| andesite | (noun) a dark grey volcanic rock | - |
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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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| anhydride | (noun) a compound formed from one or more other compounds in a reaction resulting in removal of water | - |
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| anode | (noun) a positively charged electrode by which electrons leave an electrical device | - |
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| (noun) the negatively charged terminal of a voltaic cell or storage battery that supplies current | - |
| antecedence | (noun) preceding in time | Synonyms: antecedency, anteriority, precedence, precedency, priority |
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| antecedency | (noun) preceding in time | Synonyms: antecedence, anteriority, precedence, precedency, priority |
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| antecedent | (noun) the referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun | - |
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| (noun) a preceding occurrence or cause or event | - |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, ascendant, ascendent, root |
| (noun) anything that precedes something similar in time | Synonyms: forerunner |
| antidepressant | (noun) any of a class of drugs used to treat depression; often have undesirable side effects | Synonyms: antidepressant drug |
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| antinode | (noun) (physics) the point of maximum displacement in a periodic system | - |
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| antipode | (noun) direct opposite | - |
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| antipodes | (noun) any two places or regions on diametrically opposite sides of the Earth | - |
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| antiredeposition | (noun) the process of preventing redeposition | - |
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| antitrade | (noun) winds blowing from west to east and lying above the trade winds in the tropics | Synonyms: antitrade wind |
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| antitrades | (noun) wind in the upper atmosphere blowing above but in the opposite direction from the trade winds | - |
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| apodeme | (noun) ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles | - |
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| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| applauder | (noun) someone who applauds | Synonyms: clapper |
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| apprehender | (noun) a person who seizes or arrests (especially a person who seizes or arrests in the name of justice) | - |
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| (noun) a person who knows or apprehends | Synonyms: knower |
| aptitude | (noun) inherent ability | - |
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| arcade | (noun) a structure composed of a series of arches supported by columns | Synonyms: colonnade |
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| (noun) a covered passageway with shops and stalls on either side | - |
| arcdegree | (noun) a measure for arcs and angles | Synonyms: degree |
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| archdeacon | (noun) (Anglican Church) an ecclesiastical dignitary usually ranking just below a bishop | - |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| ardeb | (noun) a unit of dry measure used in Egypt | - |
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| arrivederci | (noun) a farewell remark | Synonyms: adieu, adios, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| arthrodesis | (noun) the surgical fixation of a joint which is intended to result in bone fusion | - |
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| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| ascendent | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| aside | (noun) a line spoken by an actor to the audience but not intended for others on the stage | - |
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| (noun) a message that departs from the main subject | Synonyms: digression, divagation, excursus, parenthesis |