| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| adherence | (noun) faithful support for a cause or political party or religion | Synonyms: adhesion, attachment |
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| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adhesion, adhesiveness, bond |
| adherent | (noun) someone who believes and helps to spread the doctrine of another | Synonyms: disciple |
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| admonisher | (noun) someone who gives a warning so that a mistake can be avoided | Synonyms: monitor, reminder |
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| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
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| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| altogether | (noun) informal terms for nakedness | Synonyms: birthday suit, raw |
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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| anther | (noun) the part of the stamen that contains pollen; usually borne on a stalk | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| antherozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: spermatozoid |
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| antihero | (noun) a protagonist who lacks the characteristics that would make him a hero (or her a heroine) | - |
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| apheresis | (noun) a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion | Synonyms: pheresis |
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| (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: aphaeresis |
| archer | (noun) a person who is expert in the use of a bow and arrow | Synonyms: bowman |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| archery | (noun) the sport of shooting arrows with a bow | - |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| asthenosphere | (noun) the lower layer of the crust | - |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| 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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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| autobiographer | (noun) someone who writes their own biography | - |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| bather | (noun) a person who travels through the water by swimming | Synonyms: natator, swimmer |
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| (noun) a person who takes a bath | - |
| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| bellyacher | (noun) a person given to excessive complaints and crying and whining | Synonyms: complainer, crybaby, grumbler, moaner, sniveller, squawker, whiner |
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| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bibliographer | (noun) someone trained in compiling bibliographies | - |
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| biographer | (noun) someone who writes an account of a person's life | - |
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| biosphere | (noun) the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist | - |
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| bitchery | (noun) aggressive remarks and behavior like that of a spiteful malicious woman | - |
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| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| bleacher | (noun) a worker who bleaches (cloth or flour etc.) | - |
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| bleachers | (noun) (used in the plural) an outdoor grandstand without a roof; patrons are exposed to the sun as linens are when they are bleached | - |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| blucher | (noun) a high shoe with laces over the tongue | - |
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| blusher | (noun) makeup consisting of a pink or red powder applied to the cheeks | Synonyms: blush, paint, rouge |
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| (noun) yellowish edible agaric that usually turns red when touched | Synonyms: Amanita rubescens, blushing mushroom |
| botcher | (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| bother | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) an angry disturbance | Synonyms: fuss, hassle, trouble |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| breather | (noun) air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time | Synonyms: schnorchel, schnorkel, snorkel, snorkel breather |
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| (noun) a short respite | Synonyms: breath, breathing place, breathing space, breathing spell, breathing time |
| brother | (noun) a male with the same parents as someone else | Synonyms: blood brother |
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| (noun) a male person who is a fellow member (of a fraternity or religion or other group) | - |
| (noun) a close friend who accompanies his buddies in their activities | Synonyms: buddy, chum, crony, pal, sidekick |
| (noun) used as a term of address for those male persons engaged in the same movement | Synonyms: comrade |
| brotherhood | (noun) the feeling that men should treat one another like brothers | - |
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| (noun) people engaged in a particular occupation | Synonyms: fraternity, sodality |
| (noun) an organization of employees formed to bargain with the employer | Synonyms: labor union, trade union, trades union, union |
| (noun) the kinship relation between a male offspring and the siblings | - |
| burgher | (noun) a member of the middle class | Synonyms: bourgeois |
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| (noun) a citizen of an English borough | Synonyms: burgess |
| burnisher | (noun) a hand tool with polished agate tips (or other gemstone) for rubbing the gold leaf in order to obtain a highly polished surface, used in gilding. | Synonyms: burnishing tool |
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| butcher | (noun) a person who slaughters or dresses meat for market | Synonyms: slaughterer |
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| (noun) a brutal indiscriminate murderer | - |
| (noun) a retailer of meat | Synonyms: meatman |
| (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, botcher, bumbler, bungler, fuckup, fumbler, sad sack, stumbler |
| butcherbird | (noun) shrikes that impale their prey on thorns | - |
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| (noun) large carnivorous Australian bird with the shrike-like habit of impaling prey on thorns | - |
| butchering | (noun) the business of a butcher | Synonyms: butchery |
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| butchery | (noun) the business of a butcher | Synonyms: butchering |
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| (noun) the savage and excessive killing of many people | Synonyms: carnage, mass murder, massacre, slaughter |
| (noun) a building where animals are butchered | Synonyms: abattoir, shambles, slaughterhouse |
| calligrapher | (noun) someone skilled in penmanship | Synonyms: calligraphist |
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| cartographer | (noun) a person who makes maps | Synonyms: map maker |
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| catcher | (noun) the position on a baseball team of the player who is stationed behind home plate and who catches the balls that the pitcher throws | - |
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| (noun) (baseball) the person who plays the position of catcher | Synonyms: backstop |
| chemotherapy | (noun) the use of chemical agents to treat or control disease (or mental illness) | - |
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| cherimolla | (noun) large tropical fruit with leathery skin and soft pulp; related to custard apples | Synonyms: cherimoya |
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| cherimoya | (noun) large tropical fruit with leathery skin and soft pulp; related to custard apples | Synonyms: cherimolla |
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| (noun) small tropical American tree bearing round or oblong fruit | Synonyms: Annona cherimola, cherimoya tree |
| cheroot | (noun) a cigar with both ends cut flat | - |
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| cherry | (noun) a red the color of ripe cherries | Synonyms: cerise, cherry red |
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| (noun) a red fruit with a single hard stone | - |
| (noun) any of numerous trees and shrubs producing a small fleshy round fruit with a single hard stone; many also produce a valuable hardwood | Synonyms: cherry tree |
| (noun) wood of any of various cherry trees especially the black cherry | - |
| cherrystone | (noun) a half-grown quahog | Synonyms: cherrystone clam |
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| (noun) small quahog larger than a littleneck; eaten raw or cooked as in e.g. clams casino | Synonyms: cherrystone clam |
| chert | (noun) variety of silica containing microcrystalline quartz | - |
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| cherub | (noun) an angel of the second order whose gift is knowledge; usually portrayed as a winged child | - |
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| (noun) a sweet innocent baby | - |
| chervil | (noun) fresh ferny parsley-like leaves used as a garnish with chicken and veal and omelets and green salads and spinach | - |
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| (noun) aromatic annual Old World herb cultivated for its finely divided and often curly leaves for use especially in soups and salads | Synonyms: Anthriscus cereifolium, beaked parsley |
| chincherinchee | (noun) South African perennial with long-lasting spikes of white blossoms that are shipped in to Europe and America for use as winter cut flowers | Synonyms: Ornithogalum thyrsoides, wonder flower |
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| chokecherry | (noun) a common wild cherry of eastern North America having small bitter black berries favored by birds | Synonyms: chokecherry tree, Prunus virginiana |
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| (noun) the fruit of the chokecherry tree | - |
| choreographer | (noun) someone who creates new dances | - |
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| chromosphere | (noun) a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun | - |
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| chrysotherapy | (noun) the use of chemicals containing gold for treating diseases (such as rheumatoid arthritis) | - |
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| cinematographer | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cameraman |
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| cipher | (noun) a secret method of writing | Synonyms: cryptograph, cypher, secret code |
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| (noun) a message written in a secret code | Synonyms: cypher |
| (noun) a person of no influence | Synonyms: cypher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cypher, nought, zero |
| cither | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: zither, zithern |
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| (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cithern, citole, cittern, gittern |
| cithern | (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cither, citole, cittern, gittern |
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| clincher | (noun) a tool used to clinch nails or bolts or rivets | - |
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| (noun) a point or fact or remark that settles something conclusively | Synonyms: decisive factor |
| (noun) an argument that is conclusive | Synonyms: determiner, determining factor |
| coherence | (noun) logical and orderly and consistent relation of parts | Synonyms: coherency |
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| (noun) the state of cohering or sticking together | Synonyms: coherency, cohesion, cohesiveness |
| coherency | (noun) logical and orderly and consistent relation of parts | Synonyms: coherence |
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| (noun) the state of cohering or sticking together | Synonyms: coherence, cohesion, cohesiveness |
| cosmographer | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographist |
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| cowcatcher | (noun) an inclined metal frame at the front of a locomotive to clear the track | Synonyms: buffer, fender, pilot |
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| cowherb | (noun) European annual with pale rose-colored flowers; cultivated flower or self-sown grainfield weed; introduced in North America; sometimes classified as a soapwort | Synonyms: cow cockle, Saponaria vaccaria, Vaccaria hispanica, Vaccaria pyramidata |
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| cowherd | (noun) a hired hand who tends cattle and performs other duties on horseback | Synonyms: cowhand, cowpoke, cowpuncher, puncher |
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| cowpuncher | (noun) a hired hand who tends cattle and performs other duties on horseback | Synonyms: cowhand, cowherd, cowpoke, puncher |
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| crasher | (noun) someone who gets in (to a party) without an invitation or without paying | Synonyms: gatecrasher, unwelcome guest |
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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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| crusher | (noun) a device that crushes something | - |
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| cryptographer | (noun) decoder skilled in the analysis of codes and cryptograms | Synonyms: cryptanalyst, cryptologist |
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| crystallographer | (noun) a specialist in crystallography | - |
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| cypher | (noun) a secret method of writing | Synonyms: cipher, cryptograph, secret code |
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| (noun) a message written in a secret code | Synonyms: cipher |
| (noun) a person of no influence | Synonyms: cipher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, nought, zero |
| debaucher | (noun) someone who assaults others sexually | Synonyms: ravisher, violator |
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| debauchery | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, bacchanalia, debauch, drunken revelry, orgy, riot, saturnalia |
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| decipherer | (noun) a reader capable of reading and interpreting illegible or obscure text | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decoder |
| decipherment | (noun) the activity of making clear or converting from code into plain text | Synonyms: decoding, decryption |
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| demographer | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographist, population scientist |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diathermy | (noun) a method of physical therapy that involves generating local heat in body tissues by high-frequency electromagnetic currents | - |
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