| 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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| allamanda | (noun) a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes | - |
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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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| aloha | (noun) an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian) | Synonyms: ciao |
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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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| alpaca | (noun) domesticated llama with long silky fleece; believed to be a domesticated variety of the guanaco | Synonyms: Lama pacos |
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| (noun) a thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that wool | - |
| (noun) wool of the alpaca | - |
| alpha | (adjective) early testing stage of a software or hardware product | - |
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| (adjective) first in order of importance | - |
| (noun) the 1st letter of the Greek alphabet | - |
| (noun) the beginning of a series or sequence | - |
| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| althea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, hollyhock |
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| alula | (noun) tuft of small stiff feathers on the first digit of a bird's wing | Synonyms: bastard wing, spurious wing |
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| (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: calypter |
| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| alumna | (noun) a female person who has received a degree from a school (high school or college or university) | - |
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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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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| 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 |
| ameba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: amoeba |
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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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| amenorrhea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhoea |
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| amenorrhoea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhea |
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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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| amoeba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: ameba |
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| amora | (noun) one of a group of rabbis (active AD 250-500) who discussed the Mishnaic law in the law schools of Palestine and Mesopotamia where they explained and applied earlier teachings and whose discussions are recorded in the Talmud; they emphasized the study of Torah and the importance of personal action and the fulfillment of the commandments | - |
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| amorpha | (noun) any plant of the genus Amorpha having odd-pinnate leaves and purplish spicate flowers | - |
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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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| amphisbaena | (noun) (classical mythology) a serpent with a head at each end of its body | - |
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| amphiuma | (noun) aquatic eel-shaped salamander having two pairs of very small feet; of still muddy waters in the southern United States | Synonyms: blind eel, congo eel, congo snake |
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| amphora | (noun) an ancient jar with two handles and a narrow neck; used to hold oil or wine | - |
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| ampulla | (noun) a flask that has two handles; used by Romans for wines or oils | - |
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| (noun) the dilated portion of a canal or duct especially of the semicircular canals of the ear | - |
| amygdala | (noun) an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior | Synonyms: amygdaloid nucleus, corpus amygdaloideum |
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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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| ana | (noun) a collection of anecdotes about a person or place | - |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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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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| analecta | (noun) a collection of excerpts from a literary work | Synonyms: analects |
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| analgesia | (noun) absence of the sense of pain without loss of consciousness | - |
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| anaphora | (noun) using a pronoun or similar word instead of repeating a word used earlier | - |
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| (noun) repetition of a word or phrase at the beginning of successive clauses | Synonyms: epanaphora |
| 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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| anasarca | (noun) generalized edema with accumulation of serum in subcutaneous connective tissue | - |
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| anathema | (noun) a formal ecclesiastical curse accompanied by excommunication | - |
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| (noun) a detested person | Synonyms: bete noire |
| anchusa | (noun) any of various Old World herbs of the genus Anchusa having one-sided clusters of trumpet-shaped flowers | - |
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| andrena | (noun) a bee that is a member of the genus Andrena | Synonyms: andrenid, mining bee |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| androphobia | (noun) a morbid fear of men | - |
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| andryala | (noun) any plant of the genus Andryala having milky sap and heads of bright yellow flowers | - |
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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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| angelica | (noun) aromatic stems or leaves or roots of Angelica Archangelica | - |
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| (noun) candied stalks of the angelica plant | - |
| (noun) any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels | Synonyms: angelique |
| angina | (noun) any disease of the throat or fauces marked by spasmodic attacks of intense suffocative pain | - |
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| (noun) a heart condition marked by paroxysms of chest pain due to reduced oxygen to the heart | Synonyms: angina pectoris |
| 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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| 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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| angioma | (noun) a tumor consisting of a mass of blood or lymphatic vessels | - |
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| angiosarcoma | (noun) a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels | - |
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| angiotelectasia | (noun) dilation and enlargement of arterioles | - |
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| angostura | (noun) the bitter bark of a South American tree; used in medicines and liqueurs and bitters | Synonyms: angostura bark |
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| anhedonia | (noun) an inability to experience pleasure | - |
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| anhinga | (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: darter, snakebird |
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| anima | (noun) (Jungian psychology) the inner self (not the external persona) that is in touch with the unconscious | - |
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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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| anna | (noun) a former copper coin of Pakistan and India | - |
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| annexa | (noun) accessory or adjoining anatomical parts or appendages to an organ (especially of the embryo) | Synonyms: adnexa |
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| anoa | (noun) small buffalo of the Celebes having small straight horns | Synonyms: Anoa depressicornis, dwarf buffalo |
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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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| anosmia | (noun) absence of the sense of smell (as by damage to olfactory nasal tissue or the olfactory nerve or by obstruction of the nasal passages) | - |
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| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxia | (noun) severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues | - |
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| antenna | (noun) one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste | Synonyms: feeler |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: aerial, transmitting aerial |
| (noun) sensitivity similar to that of a receptor organ | Synonyms: feeler |
| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antinomasia | (noun) substitution of a title for a name | - |
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| anuria | (noun) inability to urinate | Synonyms: anuresis |
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| aorta | (noun) the large trunk artery that carries blood from the left ventricle of the heart to branch arteries | - |
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