| adorer | (noun) someone who admires a young woman | Synonyms: admirer |
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| adornment | (noun) the action of decorating yourself with something colorful and interesting | - |
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| (noun) a decoration of color or interest that is added to relieve plainness | - |
| adrenal | (noun) either of a pair of complex endocrine glands situated near the kidney | Synonyms: adrenal gland, suprarenal gland |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adrenaline | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, epinephrin, epinephrine |
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| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| adrenergic | (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
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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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| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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| adsorbate | (noun) a material that has been or is capable of being adsorbed | - |
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| adsorbent | (noun) a material having capacity or tendency to adsorb another substance | Synonyms: adsorbent material |
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| adsorber | (noun) an apparatus used in the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface. | - |
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| adulterant | (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterator |
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| adulteration | (noun) the act of adulterating (especially the illicit substitution of one substance for another) | - |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: debasement |
| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| adulterer | (noun) someone who commits adultery or fornication | Synonyms: fornicator |
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| adulteress | (noun) a woman adulterer | Synonyms: fornicatress, hussy, jade, loose woman, slut, strumpet, trollop |
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| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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| adultery | (noun) extramarital sex that willfully and maliciously interferes with marriage relations | Synonyms: criminal conversation, fornication |
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| advance | (noun) the act of moving forward (as toward a goal) | Synonyms: advancement, forward motion, onward motion, procession, progress, progression |
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| (noun) increase in price or value | Synonyms: rise |
| (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: approach, feeler, overture |
| (noun) a movement forward | Synonyms: progress, progression |
| (noun) a change for the better; progress in development | Synonyms: betterment, improvement |
| (noun) an amount paid before it is earned | Synonyms: cash advance |
| advancement | (noun) the act of moving forward (as toward a goal) | Synonyms: advance, forward motion, onward motion, procession, progress, progression |
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| (noun) gradual improvement or growth or development | Synonyms: progress |
| (noun) encouragement of the progress or growth or acceptance of something | Synonyms: furtherance, promotion |
| advancer | (noun) someone who advances | - |
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| advantage | (noun) the quality of having a superior or more favorable position | Synonyms: vantage |
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| (noun) benefit resulting from some event or action | Synonyms: reward |
| (noun) (tennis) first point scored after deuce | - |
| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| advection | (noun) (meteorology) the horizontal transfer of heat or other atmospheric properties | - |
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| advent | (noun) arrival that has been awaited (especially of something momentous) | Synonyms: coming |
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| adventitia | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: tunic, tunica |
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| adventure | (noun) a wild and exciting undertaking (not necessarily lawful) | Synonyms: dangerous undertaking, escapade, risky venture |
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| adventurer | (noun) a person who enjoys taking risks | Synonyms: venturer |
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| (noun) someone who travels into little known regions (especially for some scientific purpose) | Synonyms: explorer |
| adventuress | (noun) a woman adventurer | - |
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| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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| adverb | (noun) a word that modifies something other than a noun | - |
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| (noun) the word class that qualifies verbs or clauses | - |
| adverbial | (noun) a word or group of words function as an adverb | - |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| adversity | (noun) a stroke of ill fortune; a calamitous event | - |
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| (noun) a state of misfortune or affliction | Synonyms: hard knocks, hardship |
| advert | (noun) a public promotion of some product or service | Synonyms: ad, advertisement, advertising, advertizement, advertizing |
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| advertence | (noun) the process of being heedful | Synonyms: advertency |
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| advertency | (noun) the process of being heedful | Synonyms: advertence |
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| advertisement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertising, advertizement, advertizing |
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| advertiser | (noun) someone whose business is advertising | Synonyms: adman, advertizer |
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| advertising | (noun) the business of drawing public attention to goods and services | Synonyms: merchandising, publicizing |
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| (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertizement, advertizing |
| advertizement | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertising, advertizing |
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| advertizer | (noun) someone whose business is advertising | Synonyms: adman, advertiser |
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| advertizing | (noun) a public promotion of some product or service | Synonyms: ad, advert, advertisement, advertising, advertizement |
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| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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| advice | (noun) a proposal for an appropriate course of action | - |
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| advisee | (noun) someone who receives advice | - |
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| advisement | (noun) careful consideration | Synonyms: deliberation, weighing |
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| adviser | (noun) an expert who gives advice | Synonyms: advisor, consultant |
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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 |
| adze | (noun) an edge tool used to cut and shape wood | Synonyms: adz |
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| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| aecium | (noun) fruiting body of some rust fungi bearing chains of aeciospores | - |
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| aegir | (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: bore, eager, eagre, tidal bore |
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| aegis | (noun) kindly endorsement and guidance | Synonyms: auspices, protection |
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| (noun) armor plate that protects the chest; the front part of a cuirass | Synonyms: breastplate, egis |
| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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| aerial | (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| 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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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aesthesia | (noun) mental responsiveness and awareness | Synonyms: esthesia, sensibility |
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| aesthesis | (noun) an unelaborated elementary awareness of stimulation | Synonyms: esthesis, sensation, sense datum, sense experience, sense impression |
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| aesthete | (noun) one who professes great sensitivity to the beauty of art and nature | Synonyms: esthete |
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| aesthetic | (noun) (philosophy) a philosophical theory as to what is beautiful | Synonyms: esthetic |
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| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aesthetics | (noun) (art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art) | Synonyms: esthetics |
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| aestivation | (noun) (botany) the arrangement of sepals and petals in a flower bud before it opens | Synonyms: estivation |
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| (noun) (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period | Synonyms: estivation |