| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| albatross | (noun) large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight | Synonyms: mollymawk |
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| (noun) (figurative) something that hinders or handicaps | Synonyms: millstone |
| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| amaurosis | (noun) partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain | - |
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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 |
| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| anhidrosis | (noun) failure of the sweat glands | Synonyms: anhydrosis |
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| anhydrosis | (noun) failure of the sweat glands | Synonyms: anhidrosis |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| arthrospore | (noun) one of a string of thick walled vegetative resting cells formed by some algae and fungi | - |
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| (noun) a body that resembles a spore but is not an endospore; produced by some bacteria | - |
| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| barosaur | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaurus |
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| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| blepharospasm | (noun) spasm of the eyelid muscle resulting in closure of the eye | - |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| centrosome | (noun) small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules | Synonyms: central body |
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| cerebroside | (noun) A cerebroside is any of various organic lipid compounds containing glucose or galactose and glucose; it occurs in the myelin sheath of cerebrospinal neurons. | - |
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| chiaroscuro | (noun) a monochrome picture made by using several different shades of the same color | - |
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| chlorosis | (noun) iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin | Synonyms: greensickness |
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| chondrosarcoma | (noun) a malignant neoplasm of cartilage cells | - |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| colpoxerosis | (noun) a condition in which the vagina is unusually dry | - |
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| corrosion | (noun) erosion by chemical action | Synonyms: corroding, erosion |
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| (noun) a state of deterioration in metals caused by oxidation or chemical action | - |
| corrosive | (noun) a substance having the tendency to cause corrosion (such a strong acids or alkali) | - |
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| crisscross | (noun) a marking that consists of lines that cross each other | Synonyms: cross, mark |
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| crosier | (noun) a staff surmounted by a crook or cross carried by bishops as a symbol of pastoral office | Synonyms: crozier |
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| cross | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: crossbreeding, crossing, hybridisation, hybridization, hybridizing, interbreeding |
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| (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: crossbreed, hybrid |
| (noun) a wooden structure consisting of an upright post with a transverse piece | - |
| (noun) a marking that consists of lines that cross each other | Synonyms: crisscross, mark |
| (noun) any affliction that causes great suffering | Synonyms: crown of thorns |
| crossbar | (noun) long thin horizontal crosspiece between two vertical posts | - |
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| (noun) game equipment consisting of a horizontal bar to be jumped or vaulted over | - |
| (noun) a horizontal bar that goes across something | - |
| crossbeam | (noun) a horizontal beam that extends across something | Synonyms: crosspiece, trave, traverse |
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| crossbench | (noun) any of the seats in the House of Commons used by members who do not vote regularly with either the government or the Opposition | - |
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| crossbencher | (noun) a member of the House of Commons who does not vote regularly with either the government or the Opposition | - |
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| crossbill | (noun) finch with a bill whose tips cross when closed | Synonyms: Loxia curvirostra |
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| crossbones | (noun) two crossed bones (or a representation of two crossed bones) used as a symbol danger or death | - |
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| crossbow | (noun) a bow fixed transversely on a wooden stock grooved to direct the arrow (quarrel) | - |
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| crossbreed | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, hybrid |
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| crossbreeding | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossing, hybridisation, hybridization, hybridizing, interbreeding |
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| (noun) reproduction by parents of different races (especially by white and non-white persons) | Synonyms: interbreeding, miscegenation |
| crosscheck | (noun) an illegal check (chopping at an opponent's arms or stick) | - |
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| (noun) an instance of confirming something by considering information from several sources | - |
| crosscurrent | (noun) actions counter to the main group activity | Synonyms: countercurrent |
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| (noun) a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current | Synonyms: countercurrent, rip, riptide, tide rip |
| crosscut | (noun) a route shorter than the usual one | Synonyms: cutoff, shortcut |
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| (noun) a diagonal path | - |
| crosse | (noun) a long racket with a triangular frame; used in playing lacrosse | - |
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| crossfire | (noun) fire from two or more points so that the lines of fire cross | - |
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| (noun) a lively or heated interchange of ideas and opinions | - |
| crosshairs | (noun) a center of interest | - |
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| crosshatch | (noun) shading consisting of multiple crossing lines | Synonyms: hachure, hatch, hatching |
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| crosshead | (noun) metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth | - |
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| (noun) a heading of a subsection printed within the body of the text | Synonyms: crossheading |
| crossheading | (noun) a heading of a subsection printed within the body of the text | Synonyms: crosshead |
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| crossing | (noun) a voyage across a body of water (usually across the Atlantic Ocean) | - |
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| (noun) traveling across | - |
| (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, hybridisation, hybridization, hybridizing, interbreeding |
| (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossover, crosswalk |
| (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossroad, crossway, intersection |
| (noun) a point where two lines (paths or arcs etc.) intersect | - |
| (noun) a shallow area in a stream that can be forded | Synonyms: ford |
| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| crossness | (noun) a disposition to be ill-tempered | Synonyms: crabbedness, crabbiness |
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| (noun) an irritable petulant feeling | Synonyms: choler, fretfulness, fussiness, irritability, peevishness, petulance |
| crossopterygian | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: lobe-finned fish, lobefin |
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| crossover | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crosswalk |
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| (noun) the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience | - |
| (noun) a voter who is registered as a member of one political party but who votes in the primary of another party | Synonyms: crossover voter |
| (noun) the interchange of sections between pairing homologous chromosomes during the prophase of meiosis | Synonyms: crossing over |
| crosspatch | (noun) a bad-tempered person | Synonyms: churl, crank, grouch, grump |
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| crosspiece | (noun) a transverse brace | - |
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| (noun) a horizontal beam that extends across something | Synonyms: crossbeam, trave, traverse |
| crossroad | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossway, intersection |
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| crossroads | (noun) a point where a choice must be made | - |
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| (noun) a community of people smaller than a village | Synonyms: hamlet |
| (noun) a crisis situation or point in time when a critical decision must be made | Synonyms: critical point, juncture |
| crosstalk | (noun) the presence of an unwanted signal via an accidental coupling | Synonyms: XT |
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| crosstie | (noun) one of the cross braces that support the rails on a railway track | Synonyms: railroad tie, sleeper, tie |
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| crosswalk | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crossover |
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| crossway | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossroad, intersection |
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| crosswind | (noun) wind blowing across the path of a ship or aircraft | - |
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| crossword | (noun) a puzzle in which words corresponding to numbered clues are to be found and written in to squares in the puzzle | Synonyms: crossword puzzle |
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| defroster | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: deicer |
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| dermatosclerosis | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: scleroderma |
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| dextrose | (noun) an isomer of glucose that is found in honey and sweet fruits | Synonyms: dextroglucose, grape sugar |
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| diarthrosis | (noun) a joint so articulated as to move freely | Synonyms: articulatio synovialis, synovial joint |
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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| droshky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: drosky |
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| drosky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: droshky |
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| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dross | (noun) the scum formed by oxidation at the surface of molten metals | Synonyms: scoria, slag |
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| (noun) worthless or dangerous material that should be removed | Synonyms: impurity |
| dysprosium | (noun) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic | Synonyms: atomic number 66, Dy |
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| electroscope | (noun) measuring instrument that detects electric charge; two gold leaves diverge owing to repulsion of charges with like sign | - |
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| electroshock | (noun) the administration of a strong electric current that passes through the brain to induce convulsions and coma | Synonyms: ECT, electroconvulsive therapy, electroshock therapy |
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| electrosleep | (noun) unconsciousness brought about by the passage of a low voltage electric current through the brain | - |
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| electrostatics | (noun) the branch of physics that deals with static electricity | - |
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| electrosurgery | (noun) surgery performed with electrical devices (as in electrocautery) | - |
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| enarthrosis | (noun) a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone | Synonyms: articulatio spheroidea, ball-and-socket joint, cotyloid joint, enarthrodial joint, spheroid joint |
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| engrossment | (noun) the quality of being intent and concentrated | Synonyms: intentness |
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| (noun) the mental state of being preoccupied by something | Synonyms: absorption, preoccupancy, preoccupation |
| (noun) complete attention; intense mental effort | Synonyms: absorption, concentration, immersion |
| enteroscope | (noun) an instrument for inspecting the inside of the intestine. | - |
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| enterostenosis | (noun) abnormal narrowing of the intestine | - |
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| enterostomy | (noun) surgical operation that creates a permanent opening through the abdominal wall into the intestine | Synonyms: enterotomy |
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| eros | (noun) a desire for sexual intimacy | Synonyms: concupiscence, physical attraction, sexual desire |
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| erosion | (noun) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively | Synonyms: eating away, eroding, wearing, wearing away |
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| (noun) erosion by chemical action | Synonyms: corroding, corrosion |
| (noun) a gradual decline of something | - |
| (noun) condition in which the earth's surface is worn away by the action of water and wind | - |
| erosiveness | (noun) The state or quality of causing or tending to wear away or erode. | - |
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| extrospection | (noun) examination or observation of what is outside oneself, as opposed to introspection. | - |
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| fibrosis | (noun) development of excess fibrous connective tissue in an organ | - |
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| fibrositis | (noun) inflammation of white fibrous tissues (especially muscle sheaths) | - |
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| fibrosity | (noun) the quality of being fibrous | Synonyms: fibrousness |
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| fluoroscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: roentgenoscope |
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| fluoroscopy | (noun) examination of body structures using a fluoroscope | - |
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| fluorosis | (noun) a pathological condition resulting from an excessive intake of fluorine (usually from drinking water) | - |
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| frost | (noun) weather cold enough to cause freezing | Synonyms: freeze |
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| (noun) the formation of frost or ice on a surface | Synonyms: icing |
| (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: hoar, hoarfrost, rime |
| frostbite | (noun) destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene | Synonyms: cryopathy |
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