| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
|---|
| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
|---|
| airhead | (noun) a bridgehead seized by airborne troops | - |
|---|
| (noun) a flighty scatterbrained simpleton | - |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
|---|
| albedo | (noun) the ratio of reflected to incident light | Synonyms: reflective power |
|---|
| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
|---|
| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
|---|
| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
|---|
| 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 |
|---|
| (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 |
|---|
| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
|---|
| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
|---|
| aldol | (noun) an oily colorless liquid obtained by the condensation of two molecules of acetaldehyde; contains an alcohol group (-OH) and an aldehyde group (-CHO) | Synonyms: aldehyde-alcohol |
|---|
| aldose | (noun) a monosaccharide sugar that contains the aldehyde group or is hemiacetal | - |
|---|
| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
|---|
| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
|---|
| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
|---|
| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
|---|
| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
|---|
| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
|---|
| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
|---|
| alhamdulilah | (noun) An expression meaning 'praise God' in Arabic | - |
|---|
| alidad | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidade |
|---|
| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidade |
| alidade | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidad |
|---|
| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidad |
| alkaloid | (noun) natural bases containing nitrogen found in plants | - |
|---|
| alkyd | (noun) a durable synthetic resin widely used in adhesives and paints | Synonyms: alkyd resin |
|---|
| allamanda | (noun) a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes | - |
|---|
| allemande | (noun) egg-thickened veloute | Synonyms: allemande sauce |
|---|
| allgood | (noun) European plant naturalized in North America; often collected from the wild as a potherb | Synonyms: Chenopodium bonus-henricus, fat hen, good-king-henry, wild spinach |
|---|
| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
|---|
| almandine | (noun) a purple variety of the ruby spinel | - |
|---|
| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
|---|
| almond | (noun) oval-shaped edible seed of the almond tree | - |
|---|
| (noun) small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California | Synonyms: Amygdalus communis, Prunus amygdalus, Prunus dulcis, sweet almond |
| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
|---|
| (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) | - |
| alundum | (noun) a substance made of fused alumina | - |
|---|
| amadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: avadavat |
|---|
| ambassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: embassador |
|---|
| (noun) an informal representative | - |
| ambassadorship | (noun) the post of ambassador | - |
|---|
| ambassadress | (noun) a woman ambassador | - |
|---|
| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
|---|
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
|---|
| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
|---|
| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
|---|
| amendment | (noun) the act of amending or correcting | - |
|---|
| (noun) a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) | - |
| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
|---|
| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| amide | (noun) any organic compound containing the group -CONH2 | - |
|---|
| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
|---|
| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
|---|
| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
|---|
| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
|---|
| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
|---|
| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
|---|
| amphidiploidy | (noun) the condition of being amphidiploid | - |
|---|
| amphipod | (noun) a kind of malacostracan crustacean | - |
|---|
| amplitude | (noun) greatness of magnitude | - |
|---|
| (noun) the property of copious abundance | Synonyms: bountifulness, bounty |
| (noun) (physics) the maximum displacement of a periodic wave | - |
| 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 |
|---|
| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
|---|
| amygdaloid | (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
|---|
| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
|---|
| amyloid | (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
|---|
| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| amyloidosis | (noun) a disorder characterized by deposit of amyloid in organs or tissues; often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma | - |
|---|
| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
|---|
| anadiplosis | (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: reduplication |
|---|
| analysand | (noun) a person undergoing psychoanalysis | - |
|---|
| anaphrodisia | (noun) decline or absence of sexual desire | - |
|---|
| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
|---|
| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
|---|
| andante | (noun) a musical composition or musical passage to be performed moderately slow | - |
|---|
| (noun) a moderately slow tempo (a walking pace) | - |
| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
|---|
| andesite | (noun) a dark grey volcanic rock | - |
|---|
| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
|---|
| andradite | (noun) a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone | - |
|---|
| andrena | (noun) a bee that is a member of the genus Andrena | Synonyms: andrenid, mining bee |
|---|
| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
|---|
| androecium | (noun) a male gametoecium | - |
|---|
| androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
|---|
| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
|---|
| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
|---|
| androglossia | (noun) a woman's voice with male qualities | - |
|---|
| androgyne | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: epicene, epicene person, gynandromorph, hermaphrodite, intersex |
|---|
| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
|---|
| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
|---|
| (noun) An operating system from Google for mobile devices | - |
| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
|---|
| (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 | - |
|---|
| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
|---|
| andryala | (noun) any plant of the genus Andryala having milky sap and heads of bright yellow flowers | - |
|---|
| anecdotalism | (noun) The property of being related to short accounts of real incidents or persons, often humorous or interesting. | - |
|---|
| anecdote | (noun) short account of an incident (especially a biographical one) | - |
|---|
| anecdotist | (noun) a person skilled in telling anecdotes | Synonyms: raconteur |
|---|
| aneroid | (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
|---|
| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
|---|
| angiocardiogram | (noun) a series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substance | - |
|---|
| 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 |
|---|
| angledozer | (noun) a bulldozer with an angled moldboard to push earth to one side | - |
|---|
| anhedonia | (noun) an inability to experience pleasure | - |
|---|
| anhidrosis | (noun) failure of the sweat glands | Synonyms: anhydrosis |
|---|
| anhydride | (noun) a compound formed from one or more other compounds in a reaction resulting in removal of water | - |
|---|
| anhydrosis | (noun) failure of the sweat glands | Synonyms: anhidrosis |
|---|
| animadversion | (noun) harsh criticism or disapproval | Synonyms: censure |
|---|
| aniseed | (noun) liquorice-flavored seeds, used medicinally and in cooking and liquors | Synonyms: anise, anise seed |
|---|