| accoucheur | (noun) a physician specializing in obstetrics | Synonyms: obstetrician |
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| accoucheuse | (noun) a woman skilled in aiding the delivery of babies | Synonyms: midwife |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| adieu | (noun) a farewell remark | Synonyms: adios, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| aleuronic | (adjective) of or related to aleurone | - |
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| amateur | (adjective) engaged in as a pastime | Synonyms: recreational, unpaid |
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| (adjective) lacking professional skill or expertise | Synonyms: amateurish, inexpert, unskilled |
| (noun) someone who pursues a study or sport as a pastime | - |
| (noun) an athlete who does not play for pay | - |
| amateurish | (adjective) lacking professional skill or expertise | Synonyms: amateur, inexpert, unskilled |
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| amateurishly | (adverb) in an amateurish manner | - |
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| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| amateurism | (noun) the conviction that people should participate in sports as a hobby (for the fun of it) rather than for money | - |
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| aneuploid | (adjective) having a chromosome number that is not an exact multiple of the haploid number | - |
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| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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| aneurin | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: antiberiberi factor, thiamin, thiamine, vitamin B1 |
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| aneurism | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurysm |
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| aneurismal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismatic, aneurysmal, aneurysmatic |
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| aneurismatic | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurysmal, aneurysmatic |
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| aneurysm | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurism |
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| aneurysmal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurismatic, aneurysmatic |
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| aneurysmatic | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurismatic, aneurysmal |
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| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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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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| aponeurotic | (adjective) of or relating to an aponeurosis | - |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| auteur | (noun) a filmmaker who has a personal style and keeps creative control over his or her works | - |
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| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| berceuse | (noun) a quiet song intended to lull a child to sleep | Synonyms: cradlesong, lullaby |
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| bleu | (noun) cheese containing a blue mold | Synonyms: blue cheese |
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| boeuf | (noun) meat from an adult domestic bovine | Synonyms: beef |
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| bonheur | (noun) (French) happiness and good humor | - |
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| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| caduceus | (noun) an insignia used by the medical profession; modeled after the staff of Hermes | - |
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| calcaneus | (noun) the largest tarsal bone; forms the human heel | Synonyms: heelbone, os tarsi fibulare |
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| calceus | (noun) a shoe covering the ankle; worn by ancient Romans | - |
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| carillonneur | (noun) a musician who plays a carillon | - |
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| chartreuse | (adjective) of something having the yellowish green color of Chartreuse liqueur | - |
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| (noun) a shade of green tinged with yellow | Synonyms: Paris green, pea green, yellow green, yellowish green |
| chauffeur | (noun) a person paid to drive a privately owned car | - |
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| (verb) drive someone in a vehicle | Synonyms: drive around |
| chauffeuse | (noun) a woman chauffeur | - |
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| chemotherapeutic | (adjective) of or relating to chemotherapy | Synonyms: chemotherapeutical |
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| chemotherapeutical | (adjective) of or relating to chemotherapy | Synonyms: chemotherapeutic |
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| closeup | (noun) a photograph taken at close range | - |
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| clypeus | (noun) a shield-like plate on the front of an insect's head | - |
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| coiffeur | (noun) a man hairdresser | - |
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| coiffeuse | (noun) a woman hairdresser | - |
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| coleus | (noun) any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers | Synonyms: flame nettle |
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| coliseum | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, amphitheatre |
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| comeupance | (noun) an outcome (good or bad) that is well deserved and fitting | Synonyms: comeuppance, just deserts, poetic justice |
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| comeuppance | (noun) an outcome (good or bad) that is well deserved and fitting | Synonyms: comeupance, just deserts, poetic justice |
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| connoisseur | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: cognoscente |
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| connoisseurship | (noun) love of or taste for fine objects of art | Synonyms: vertu, virtu |
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| corneum | (noun) the outermost layer of the epidermis consisting of dead cells that slough off | Synonyms: horny layer, stratum corneum |
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| cuneus | (noun) any shape that is triangular in cross section | Synonyms: wedge, wedge shape |
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| danseur | (noun) a male ballet dancer who is the partner of a ballerina | Synonyms: danseur noble |
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| danseuse | (noun) a female ballet dancer | Synonyms: ballerina |
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| dejeuner | (noun) a midday meal | Synonyms: lunch, luncheon, tiffin |
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| deuce | (noun) one of the four playing cards in a deck that have two spots | Synonyms: two |
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| (noun) a word used in exclamations of confusion | Synonyms: devil, dickens |
| (noun) the cardinal number that is the sum of one and one or a numeral representing this number | Synonyms: 2, II, two |
| (noun) a tie in tennis or table tennis that requires winning two successive points to win the game | - |
| deuced | (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, goddam, goddamn, goddamned, infernal |
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| deucedly | (adverb) (used as intensives) excessively | Synonyms: deadly, devilishly, insanely, madly |
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| deuteranopia | (noun) dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red | Synonyms: Daltonism, green-blindness |
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| deuteranopic | (adjective) inability to see the color green or to distinguish green and purplish-red | Synonyms: green-blind |
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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| deutzia | (noun) any of various shrubs of the genus Deutzia having usually toothed opposite leaves and shredding bark and white or pink flowers in loose terminal clusters | - |
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| effleurage | (noun) a rhythmic stroking | - |
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| electroneutral | (adjective) having no net electric charge | Synonyms: neutral |
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| endoneurium | (noun) delicate connective tissue around individual nerve fibers in nerve | - |
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| endosteum | (noun) vascular membrane that lines the inner surface of long bones | - |
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| entrepreneur | (noun) someone who organizes a business venture and assumes the risk for it | Synonyms: enterpriser |
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| entrepreneurial | (adjective) of or relating to an entrepreneur | - |
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| (adjective) willing to take risks in order to make a profit | - |
| eubacteria | (noun) a large group of bacteria having rigid cell walls; motile types have flagella | Synonyms: eubacterium, true bacteria |
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| eubacterium | (noun) a large group of bacteria having rigid cell walls; motile types have flagella | Synonyms: eubacteria, true bacteria |
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| eucalypt | (noun) a tree of the genus Eucalyptus | Synonyms: eucalyptus, eucalyptus tree |
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| eucalyptus | (noun) a tree of the genus Eucalyptus | Synonyms: eucalypt, eucalyptus tree |
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| (noun) wood of any of various eucalyptus trees valued as timber | - |
| eucaryote | (noun) an organism with cells characteristic of all life forms except primitive microorganisms such as bacteria; i.e. an organism with `good' or membrane-bound nuclei in its cells | Synonyms: eukaryote |
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| eucaryotic | (adjective) having cells with `good' or membrane-bound nuclei | Synonyms: eukaryotic |
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| euchre | (noun) a card game similar to ecarte; each player is dealt 5 cards and the player making trump must take 3 tricks to win a hand | Synonyms: five hundred |
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| euclidean | (adjective) relating to geometry as developed by Euclid | Synonyms: euclidian |
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| euclidian | (adjective) relating to geometry as developed by Euclid | Synonyms: euclidean |
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| eudaemon | (noun) a benevolent spirit | Synonyms: eudemon, good spirit |
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| eudaemonia | (noun) a contented state of being happy and healthy and prosperous | Synonyms: eudaimonia, upbeat, welfare, well-being, wellbeing |
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| eudaemonic | (adjective) producing happiness and well-being | Synonyms: eudemonic |
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| eudaimonia | (noun) a contented state of being happy and healthy and prosperous | Synonyms: eudaemonia, upbeat, welfare, well-being, wellbeing |
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| eudemon | (noun) a benevolent spirit | Synonyms: eudaemon, good spirit |
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| eudemonic | (adjective) producing happiness and well-being | Synonyms: eudaemonic |
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| eudemonism | (noun) an ethical system that evaluates actions by reference to personal well-being through a life based on reason | Synonyms: endaemonism |
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| eudiometer | (noun) measuring instrument consisting of a graduated glass tube for measuring volume changes in chemical reactions between gases | - |
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| eugenic | (adjective) pertaining to or causing improvement in the offspring produced | - |
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| eugenics | (noun) the study of methods of improving genetic qualities by selective breeding (especially as applied to human mating) | - |
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| euglena | (noun) minute single-celled green freshwater organism having a single flagella; often classed as algae | - |
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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| euglenophyte | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenoid |
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| eukaryote | (noun) an organism with cells characteristic of all life forms except primitive microorganisms such as bacteria; i.e. an organism with `good' or membrane-bound nuclei in its cells | Synonyms: eucaryote |
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| eukaryotic | (adjective) having cells with `good' or membrane-bound nuclei | Synonyms: eucaryotic |
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| eulogise | (verb) praise formally and eloquently | Synonyms: eulogize |
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| eulogist | (noun) an orator who delivers eulogies or panegyrics | Synonyms: panegyrist |
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