| abdominocentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: paracentesis |
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| abocclusion | (noun) the condition in which the upper teeth do not touch the lower teeth when biting | - |
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| abrocome | (noun) ratlike rodent with soft fur and large ears of the Andes | Synonyms: chinchilla rat, rat chinchilla |
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| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acanthocyte | (noun) an abnormal red blood cell that has thorny projections of protoplasm | - |
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| acanthocytosis | (noun) the presence of acanthocytes in the blood stream (as in abetalipoproteinemia) | - |
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| acrocarp | (noun) a moss in which the main axis is terminated by the archegonium (and hence the capsule) | Synonyms: acrocarpous moss |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acrocyanosis | (noun) cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion | Synonyms: Raynaud's sign |
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| adenocarcinoma | (noun) malignant tumor originating in glandular epithelium | Synonyms: glandular cancer, glandular carcinoma |
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| adhocracy | (noun) an organization with little or no structure | - |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| advocate | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocator, exponent, proponent |
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| (noun) a lawyer who pleads cases in court | Synonyms: counsel, counsellor, counselor-at-law, counselor, pleader |
| advocator | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, exponent, proponent |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| airdock | (noun) a large structure at an airport where aircraft can be stored and maintained | Synonyms: hangar, repair shed |
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| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| allocation | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allotment, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) (computer science) the assignment of particular areas of a magnetic disk to particular data or instructions | Synonyms: storage allocation |
| (noun) a share set aside for a specific purpose | Synonyms: allotment |
| allocator | (noun) a person with authority to allot or deal out or apportion | Synonyms: distributor |
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| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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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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| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amniocentesis | (noun) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities | Synonyms: amnio |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| angiocardiogram | (noun) a series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substance | - |
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| angiocarp | (noun) tree bearing fruit enclosed in a shell or involucre or husk | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropocentrism | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentricity |
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| antiknock | (noun) any of various compounds that are added to gasoline to reduce engine knocking | - |
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| apocalypse | (noun) a cosmic cataclysm in which God destroys the ruling powers of evil | - |
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| apocope | (noun) abbreviation of a word by omitting the final sound or sounds | - |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| archdiocese | (noun) the diocese of an archbishop | - |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| associate | (noun) a degree granted by a two-year college on successful completion of the undergraduates course of studies | Synonyms: associate degree |
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| (noun) any event that usually accompanies or is closely connected with another | - |
| (noun) a person who joins with others in some activity or endeavor | - |
| (noun) a friend who is frequently in the company of another | Synonyms: companion, comrade, familiar, fellow |
| (noun) a person with subordinate membership in a society, institution, or commercial enterprise | - |
| associateship | (noun) the position of associate (as in an office or academy) | - |
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| association | (noun) the act of consorting with or joining with others | - |
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| (noun) the process of bringing ideas or events together in memory or imagination | Synonyms: connection, connexion |
| (noun) a formal organization of people or groups of people | - |
| (noun) (ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species | - |
| (noun) (chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding | - |
| (noun) a relation resulting from interaction or dependence | - |
| (noun) a social or business relationship | Synonyms: affiliation, tie-up, tie |
| (noun) the state of being connected together as in memory or imagination | - |
| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| astrocyte | (noun) comparatively large neuroglial cell | - |
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| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| atrocity | (noun) an act of atrocious cruelty | Synonyms: inhumanity |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, barbarity, barbarousness, heinousness |
| audiocassette | (noun) a cassette for audiotape | - |
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| aurochs | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: Bos primigenius, urus |
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| (noun) European bison having a smaller and higher head than the North American bison | Synonyms: Bison bonasus, wisent |
| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autochthon | (noun) the earliest known inhabitants of a region | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autocorrect | (noun) a system for automatically correcting text | - |
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| autocracy | (noun) a political theory favoring unlimited authority by a single individual | - |
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| (noun) a political system governed by a single individual | Synonyms: autarchy |
| autocrat | (noun) a cruel and oppressive dictator | Synonyms: despot, tyrant |
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| autocue | (noun) a device that displays words for people to read | Synonyms: prompter |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| avocado | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: aguacate, alligator pear, avocado pear |
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| (noun) tropical American tree bearing large pulpy green fruits | Synonyms: avocado tree, Persea Americana |
| avocation | (noun) an auxiliary activity | Synonyms: by-line, hobby, pursuit, sideline, spare-time activity |
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| avocet | (noun) long-legged web-footed black-and-white shorebird with slender upward-curving bill | - |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| ballcock | (noun) floating ball that controls level in a water tank | Synonyms: ball cock |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| ballock | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, bollock, egg, nut, orchis, testicle, testis |
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| bannock | (noun) a flat bread made of oat or barley flour; common in New England and Scotland | - |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| bedrock | (noun) principles from which other truths can be derived | Synonyms: basic principle, basics, fundamental principle, fundamentals |
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| (noun) solid unweathered rock lying beneath surface deposits of soil | - |
| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| bifocals | (noun) (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision | - |
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| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| binoculars | (noun) (plural) an optical instrument designed for simultaneous use by both eyes | Synonyms: field glasses, opera glasses |
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| biocatalyst | (noun) a biochemical catalyst such as an enzyme | - |
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| biochemist | (noun) someone with special training in biochemistry | - |
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| biochemistry | (noun) the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry | - |
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| biochip | (noun) a microchip that uses tiny strands of DNA to latch onto and quickly recognize thousands of genes at a time; intended for use in a biological environment | - |
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| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| bitstock | (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: brace |
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| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| bloc | (noun) a group of countries in special alliance | Synonyms: axis |
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| block | (noun) the act of obstructing or deflecting someone's movements | Synonyms: blocking |
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| (noun) a solid piece of something (usually having flat rectangular sides) | - |
| (noun) an obstruction in a pipe or tube | Synonyms: blockage, closure, occlusion, stop, stoppage |
| (noun) a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope | Synonyms: pulley-block, pulley, pulley block |
| (noun) a metal casting containing the cylinders and cooling ducts of an engine | Synonyms: cylinder block, engine block |
| (noun) a platform from which an auctioneer sells | Synonyms: auction block |
| (noun) housing in a large building that is divided into separate units | - |
| (noun) an inability to remember or think of something you normally can do; often caused by emotional tension | Synonyms: mental block |
| (noun) a number or quantity of related things dealt with as a unit | - |
| (noun) a rectangular area in a city surrounded by streets and usually containing several buildings | Synonyms: city block |
| (noun) (computer science) a sector or group of sectors that function as the smallest data unit permitted | - |
| (noun) a three-dimensional shape with six square or rectangular sides | Synonyms: cube |
| blockade | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: encirclement |
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| (noun) prevents access or progress | - |
| blockage | (noun) the act of blocking | Synonyms: closure, occlusion |
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| (noun) an obstruction in a pipe or tube | Synonyms: block, closure, occlusion, stop, stoppage |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: obstruction |
| blockbuster | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: megahit, smash hit |
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| (noun) a large bomb used to demolish extensive areas (as a city block) | - |
| blocker | (noun) a class of drugs that inhibit (block) some biological process | Synonyms: blocking agent |
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| (noun) a football player whose responsibility is to block players attempting to stop an offensive play | - |
| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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