| abasia | (noun) inability to walk | - |
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| abelia | (noun) any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico | - |
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| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| aboulia | (noun) a loss of will power | Synonyms: abulia |
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| abrachia | (noun) the condition of having no arms | - |
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| abulia | (noun) a loss of will power | Synonyms: aboulia |
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| acacia | (noun) any of various spiny trees or shrubs of the genus Acacia | - |
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| academia | (noun) the academic world | Synonyms: academe |
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| acapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: hypocapnia |
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| acardia | (noun) congenital absence of the heart (as in the development of some monsters) | - |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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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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| acathexia | (noun) an inability to retain bodily secretions | - |
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| acedia | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: laziness, sloth |
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| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| achlorhydria | (noun) an abnormal deficiency or absence of free hydrochloric acid in the gastric juice; often associated with severe anemias and cancer of the stomach | - |
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| acholia | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: cholestasis |
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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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| 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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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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| achylia | (noun) absence of gastric juices (partial or complete) | Synonyms: achylia gastrica |
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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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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| administrivia | (noun) the tiresome but essential details that must be taken care of and tasks that must be performed in running an organization | - |
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| adventitia | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: tunic, tunica |
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| adynamia | (noun) lack of strength or vigor (especially from illness) | - |
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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aesthesia | (noun) mental responsiveness and awareness | Synonyms: esthesia, sensibility |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| agalactia | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactosis |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agenesia | (noun) imperfect development; nondevelopment of a part | Synonyms: agenesis |
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| agerasia | (noun) youthful appearance in an old person | - |
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| agnosia | (noun) inability to recognize objects by use of the senses | - |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| 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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| 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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| 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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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| 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 |
| 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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| 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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| 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 |
| 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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| 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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| 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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| 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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