| abase | (verb) cause to feel shame; hurt the pride of | Synonyms: chagrin, humble, humiliate, mortify |
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| abasement | (noun) depriving one of self-esteem | Synonyms: humiliation |
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| (noun) a low or downcast state | Synonyms: abjection, degradation |
| abash | (verb) cause to be embarrassed; cause to feel self-conscious | Synonyms: embarrass |
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| abashed | (adjective) feeling or caused to feel ill at ease or self-conscious or ashamed | Synonyms: chagrined, embarrassed |
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| abashment | (noun) feeling embarrassed due to modesty | Synonyms: bashfulness |
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| abasia | (noun) inability to walk | - |
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| abasic | (adjective) of or relating to abasia (inability to walk) | Synonyms: abatic |
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| abdominoplasty | (noun) cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach | Synonyms: tummy tuck |
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| abomasal | (adjective) relating to the abomasum (the fourth compartment of the stomach of ruminants) | - |
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| abomasum | (noun) the fourth compartment of the stomach of a ruminant; the one where digestion takes place | Synonyms: fourth stomach |
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| abrase | (verb) wear away | Synonyms: abrade, corrade, rub down, rub off |
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| abrasion | (noun) the wearing down of rock particles by friction due to water or wind or ice | Synonyms: attrition, detrition, grinding |
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| (noun) erosion by friction | Synonyms: attrition, corrasion, detrition |
| (noun) an abraded area where the skin is torn or worn off | Synonyms: excoriation, scrape, scratch |
| abrasive | (adjective) sharply disagreeable; rigorous | Synonyms: harsh |
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| (adjective) causing abrasion | Synonyms: scratchy |
| (noun) a substance that abrades or wears down | Synonyms: abradant, abrasive material |
| abrasiveness | (noun) the roughness of a substance that causes abrasions | Synonyms: harshness, scratchiness |
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| (noun) the quality of being sharply disagreeable | - |
| abreast | (adjective) being up to particular standard or level especially in being up to date in knowledge | Synonyms: au courant, au fait, up on |
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| (adverb) alongside each other, facing in the same direction | - |
| acariasis | (noun) infestation with itch mites | Synonyms: acaridiasis, acariosis |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| acataphasia | (noun) a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| admass | (noun) the segment of the public that is easily influenced by mass media (chiefly British) | - |
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| admeasure | (verb) determine the quantity of someone's share | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| agerasia | (noun) youthful appearance in an old person | - |
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| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| (noun) a very light white | - |
| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alas | (adverb) by bad luck | Synonyms: regrettably, unfortunately, unluckily |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| alias | (noun) a name that has been assumed | Synonyms: assumed name, false name |
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| (adverb) as known or named at another time or place | Synonyms: a.k.a., also known as |
| alocasia | (noun) any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries | Synonyms: elephant's ear, elephant ear |
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| amass | (verb) increase in amount by collecting or gathering | Synonyms: accumulate, conglomerate, cumulate, gather, pile up |
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| (verb) get or gather together | Synonyms: accumulate, collect, compile, hoard, pile up, roll up |
| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| ambassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: embassador |
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| (noun) an informal representative | - |
| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| ambassadorship | (noun) the post of ambassador | - |
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| ambassadress | (noun) a woman ambassador | - |
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| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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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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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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| amylase | (noun) any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar | - |
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| ananas | (noun) large sweet fleshy tropical fruit with a terminal tuft of stiff leaves; widely cultivated | Synonyms: pineapple |
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| anancasm | (noun) An obsolete term for ritualistic act or sequence of acts performed by a person with obsessive-compulsive neurosis. | - |
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| anaphase | (noun) the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle | - |
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| anaphasic | (adjective) of or related to the stage of mitosis known as anaphase | - |
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| anaplasia | (noun) loss of structural differentiation within a cell or group of cells often with increased capacity for multiplication, as in a malignant tumor | - |
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| anaplasmosis | (noun) a disease of cattle that is transmitted by cattle ticks; similar to Texas fever | - |
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| anaplastic | (adjective) of or relating to anaplasia | - |
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| anaplasty | (noun) surgery concerned with therapeutic or cosmetic reformation of tissue | Synonyms: plastic surgery, reconstructive surgery |
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| anasarca | (noun) generalized edema with accumulation of serum in subcutaneous connective tissue | - |
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| anasarcous | (adjective) characterized by or affected by dropsy | - |
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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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| anastalsis | (noun) muscular action of the alimentary tract in a direction opposite to peristalsis | - |
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| anastigmat | (noun) compound lens or lens system designed to be free of astigmatism and able to form approximately point images | - |
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| anastigmatic | (adjective) not astigmatic | Synonyms: stigmatic |
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| (adjective) pertaining to a lens or lens system free of astigmatism (able to form point images) | Synonyms: stigmatic |
| anastomose | (verb) cause to join or open into each other by anastomosis | Synonyms: inosculate |
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| (verb) come together or open into each other | Synonyms: inosculate |
| anastomosis | (noun) a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous | Synonyms: inosculation |
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| anastomotic | (adjective) of or relating to or exhibiting anastomosis | - |
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| anastrophe | (noun) the reversal of the normal order of words | Synonyms: inversion |
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| anastylosis | (noun) the archeological reassembly of ruined monuments from fallen or decayed fragments (incorporating new materials when necessary) | - |
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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| anorgasmia | (noun) absence of an orgasm in sexual relations | - |
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| antialiasing | (noun) (computer graphics) a technique that is used to smooth jagged distortions in curves and diagonal lines so they appear smoother | - |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| antimacassar | (noun) a piece of ornamented cloth that protects the back of a chair from hair oils | - |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (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 |
| antinomasia | (noun) substitution of a title for a name | - |
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| antipasto | (noun) a course of appetizers in an Italian meal | - |
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| antiphrasis | (noun) the use of a word in a sense opposite to its normal sense (especially in irony) | - |
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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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| aphasia | (noun) inability to use or understand language (spoken or written) because of a brain lesion | - |
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| aphasic | (adjective) related to or affected by aphasia | - |
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| (adjective) unable to speak because of a brain lesion | - |
| (noun) someone affected by aphasia or inability to use or understand language | - |
| aplasia | (noun) failure of some tissue or organ to develop | - |
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| apophasis | (noun) mentioning something by saying it will not be mentioned | - |
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| apostasy | (noun) the act of abandoning a party for cause | Synonyms: tergiversation |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: defection, renunciation |
| appeasable | (adjective) capable of being pacified | Synonyms: conciliable |
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| appease | (verb) make peace with | Synonyms: propitiate |
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| (verb) overcome or allay | Synonyms: quell, stay |
| (verb) cause to be more favorably inclined; gain the good will of | Synonyms: assuage, conciliate, gentle, gruntle, lenify, mollify, pacify, placate |
| appeasement | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: calming |
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| appeaser | (noun) someone who tries to bring peace by acceding to demands | - |
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| appeasing | (adjective) intended to pacify by acceding to demands or granting concessions | Synonyms: placating, placative, placatory |
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| argasid | (noun) tick lacking a dorsal shield and having mouth parts on the under side of the head | Synonyms: soft tick |
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| arras | (noun) a wall hanging of heavy handwoven fabric often with pictorial designs | Synonyms: tapestry |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| as | (adverb) to the same degree (often followed by `as') | Synonyms: equally, every bit |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| asana | (noun) (Hinduism) a posture or manner of sitting (as in the practice of yoga) | - |
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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| asbestos | (noun) a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascend | (verb) slope upwards | - |
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| (verb) travel up | Synonyms: go up |
| (verb) come up, of celestial bodies | Synonyms: come up, rise, uprise |
| (verb) go along towards (a river's) source | - |
| (verb) move to a better position in life or to a better job | Synonyms: move up, rise |
| (verb) appear to be moving upward, as by means of tendrils | Synonyms: climb up |
| (verb) become king or queen | - |
| (verb) go back in order of genealogical succession | - |