| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| akinesia | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesis |
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| alalia | (noun) paralysis of the vocal cords resulting in an inability to speak | - |
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| albizia | (noun) any of numerous trees of the genus Albizia | Synonyms: albizzia |
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| albizzia | (noun) any of numerous trees of the genus Albizia | Synonyms: albizia |
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| albuminuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: proteinuria |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| alexia | (noun) inability to perceive written words | Synonyms: visual aphasia, word blindness |
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| alfilaria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfileria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algolagnia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algophilia |
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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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| 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 |
| alkalemia | (noun) a blood disorder characterized by a lower concentration of hydrogen ions in the blood (which rises above 7.45 on the pH scale) | - |
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| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| alkaluria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkalinuria |
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| alkaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alcaptonuria |
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| allegiance | (noun) the act of binding yourself (intellectually or emotionally) to a course of action | Synonyms: commitment, dedication, loyalty |
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| (noun) the loyalty that citizens owe to their country (or subjects to their sovereign) | Synonyms: fealty |
| allegiant | (adjective) steadfast in devotion (especially to your lawful monarch or government) | - |
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| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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| alleviate | (verb) provide physical relief, as from pain | Synonyms: assuage, palliate, relieve |
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| (verb) make easier | Synonyms: ease, facilitate |
| alleviated | (adjective) (of pain or sorrow) made easier to bear | Synonyms: eased, relieved |
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| alleviation | (noun) the act of reducing something unpleasant (as pain or annoyance) | Synonyms: easement, easing, relief |
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| (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: assuagement, relief |
| alleviative | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviatory, lenitive, mitigative, mitigatory, palliative |
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| alleviator | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, palliative |
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| (noun) a therapist who makes suffering more endurable | - |
| alleviatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, lenitive, mitigative, mitigatory, palliative |
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| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| alliance | (noun) the act of forming an alliance or confederation | Synonyms: confederation |
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| (noun) a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim | - |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, coalition |
| (noun) a connection based on kinship or marriage or common interest | Synonyms: bond |
| (noun) the state of being allied or confederated | Synonyms: confederation |
| alluvial | (adjective) of or relating to alluvium | - |
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| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| 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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| alopecia | (noun) loss of hair (especially on the head) or loss of wool or feathers; in humans it can result from heredity or hormonal imbalance or certain diseases or drugs and treatments (chemotherapy for cancer) | - |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| altricial | (adjective) (of hatchlings) naked and blind and dependent on parents for food | - |
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| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| ambrosia | (noun) (classical mythology) the food and drink of the gods; mortals who ate it became immortal | Synonyms: nectar |
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| (noun) fruit dessert made of oranges and bananas with shredded coconut | - |
| (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: bitterweed, ragweed |
| (noun) a mixture of nectar and pollen prepared by worker bees and fed to larvae | Synonyms: beebread |
| ambrosial | (adjective) worthy of the gods | Synonyms: ambrosian |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosian, nectarous |
| ambrosian | (adjective) worthy of the gods | Synonyms: ambrosial |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, nectarous |
| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| amelia | (noun) congenital absence of an arm or leg | - |
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| amenia | (noun) absence or suppression of normal menstrual flow | Synonyms: amenorrhea, amenorrhoea |
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| amentia | (noun) extreme mental retardation | Synonyms: idiocy |
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| amerciable | (adjective) of a crime or misdemeanor; punishable by a fine set by a judge | - |
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| ametria | (noun) congenital absence of the uterus | - |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amiable | (adjective) diffusing warmth and friendliness | Synonyms: affable, cordial, genial |
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| (adjective) disposed to please | Synonyms: good-humored, good-humoured |
| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amiably | (adverb) in an affable manner | Synonyms: affably, genially |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| ammonia | (noun) a pungent gas compounded of nitrogen and hydrogen (NH3) | - |
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| (noun) a water solution of ammonia | Synonyms: ammonia water, ammonium hydroxide |
| ammoniac | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniacal |
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| (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
| ammoniacal | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniac |
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| ammoniate | (verb) treat with ammonia | - |
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| ammoniated | (adjective) combined or treated with ammonia | - |
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| ammoniuria | (noun) excessive ammonia in the urine | - |
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| amnesia | (noun) partial or total loss of memory | Synonyms: blackout, memory loss |
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| amnesiac | (adjective) suffering from a partial loss of memory | Synonyms: amnesic |
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| (noun) a person suffering from amnesia | Synonyms: amnesic |
| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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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 | (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibious |
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| (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
| (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 |
| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| amyotrophia | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophy |
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| amyxia | (noun) a condition in which no mucus in produced | - |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anaemia | (noun) a deficiency of red blood cells | Synonyms: anemia |
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| (noun) a lack of vitality | Synonyms: anemia |
| anaesthesia | (noun) loss of bodily sensation with or without loss of consciousness | Synonyms: anesthesia |
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| analbuminemia | (noun) an abnormally low level of albumin in the blood serum | - |
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| analgesia | (noun) absence of the sense of pain without loss of consciousness | - |
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| anaphrodisia | (noun) decline or absence of sexual desire | - |
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| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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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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| anarthria | (noun) partial or total loss of articulate speech resulting from lesions of the central nervous system | - |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| androphobia | (noun) a morbid fear of men | - |
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| anemia | (noun) a deficiency of red blood cells | Synonyms: anaemia |
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| (noun) a lack of vitality | Synonyms: anaemia |
| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anesthesia | (noun) loss of bodily sensation with or without loss of consciousness | Synonyms: anaesthesia |
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| angiohemophilia | (noun) a form of hemophilia discovered by Erik von Willebrand; a genetic disorder that is inherited as an autosomal recessive trait; characterized by a deficiency of the coagulation factor and by mucosal bleeding | Synonyms: vascular hemophilia, von Willebrand's disease |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| anhedonia | (noun) an inability to experience pleasure | - |
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| aniseikonia | (noun) visual defect in which the shape and size of an ocular image differ in the two eyes | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| ankyloglossia | (noun) a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue | Synonyms: tongue tie |
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| annunciate | (verb) foreshadow or presage | Synonyms: announce, foretell, harbinger, herald |
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| annunciation | (noun) a formal public statement | Synonyms: announcement, declaration, proclamation |
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| annunciator | (noun) an indicator that announces which electrical circuit has been active (as on a telephone switchboard) | - |
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| annunciatory | (adjective) relating to the act of announcing or being announced | - |
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| anomia | (noun) inability to name objects or to recognize written or spoken names of objects | Synonyms: amnesic aphasia, amnestic aphasia, anomic aphasia, nominal aphasia |
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| anopia | (noun) sightlessness (especially because of a structural defect in or the absence of an eye) | - |
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| anorchia | (noun) absence of one of both testes | Synonyms: anorchidism, anorchism |
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| anorexia | (noun) a prolonged disorder of eating due to loss of appetite | - |
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| anorgasmia | (noun) absence of an orgasm in sexual relations | - |
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| anorthopia | (noun) distorted vision in which straight lines appear curved | - |
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