| frontlet | (noun) an adornment worn on the forehead | Synonyms: frontal |
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| frontmost | (adjective) preceding all others in spatial position | Synonyms: foremost |
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| frontstall | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, chanfron, front-stall, testiere |
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| frontward | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontwards |
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| frontwards | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontward |
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| gastronome | (noun) a person devoted to refined sensuous enjoyment (especially good food and drink) | Synonyms: bon vivant, epicure, epicurean, foodie, gourmet |
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| gastronomic | (adjective) of or relating to gastronomy | Synonyms: gastronomical |
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| gastronomical | (adjective) of or relating to gastronomy | Synonyms: gastronomic |
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| gastronomy | (noun) the art and practice of choosing and preparing and eating good food | - |
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| (noun) a particular style of cookery (as of a region) | - |
| geosynchronous | (adjective) of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth) | - |
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| gerontocracy | (noun) a political system governed by old men | - |
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| gerontological | (adjective) of or relating to or practicing geriatrics | Synonyms: geriatric |
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| gerontologist | (noun) a specialist in gerontology | Synonyms: geriatrician |
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| gerontology | (noun) the branch of medical science that deals with diseases and problems specific to old people | Synonyms: geriatrics |
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| glottochronological | (adjective) pertaining to the study of the evolution of languages from a common source | - |
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| glottochronology | (noun) the determination of how long ago different languages evolved from a common source language | - |
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| gridiron | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: grid |
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| (noun) the playing field on which football is played | Synonyms: football field |
| hadron | (noun) any elementary particle that interacts strongly with other particles | - |
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| headstrong | (adjective) habitually disposed to disobedience and opposition | Synonyms: froward, self-willed, wilful, willful |
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| hemipteron | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteran, hemipterous insect |
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| heron | (noun) grey or white wading bird with long neck and long legs and (usually) long bill | - |
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| heronry | (noun) a breeding ground for herons; a heron rookery | - |
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| heteronym | (noun) two words are heteronyms if they are spelled the same way but differ in pronunciation | - |
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| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hyaluronidase | (noun) an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids | Synonyms: Hyazyme, spreading factor |
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| hydronephrosis | (noun) accumulation of urine in the kidney because of an obstruction in the ureter | - |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hyperaldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: aldosteronism |
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| hyperon | (noun) any baryon that is not a nucleon; unstable particle with mass greater than a neutron | - |
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| icosahedron | (noun) any polyhedron having twenty plane faces | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| intron | (noun) sequence of a eukaryotic gene's DNA that is not translated into a protein | Synonyms: noncoding DNA |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iron | (adjective) extremely robust | Synonyms: cast-iron |
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| (noun) home appliance consisting of a flat metal base that is heated and used to smooth cloth | Synonyms: smoothing iron |
| (noun) a golf club that has a relatively narrow metal head | - |
| (noun) implement used to brand live stock | Synonyms: branding iron |
| (noun) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood | Synonyms: atomic number 26, Fe |
| (verb) press and smooth with a heated iron | Synonyms: iron out, press |
| ironclad | (adjective) inflexibly entrenched and unchangeable | Synonyms: brassbound |
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| (adjective) sheathed in iron plates for protection | - |
| (adjective) without flaws or loopholes | Synonyms: bulletproof, unassailable, unshakable, watertight |
| (noun) a wooden warship of the 19th century that is plated with iron or steel armor | - |
| ironed | (adjective) (of linens or clothes) smoothed with a hot iron | - |
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| ironic | (adjective) humorously sarcastic or mocking | Synonyms: dry, ironical, wry |
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| (adjective) characterized by often poignant difference or incongruity between what is expected and what actually is | Synonyms: ironical |
| ironical | (adjective) humorously sarcastic or mocking | Synonyms: dry, ironic, wry |
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| (adjective) characterized by often poignant difference or incongruity between what is expected and what actually is | Synonyms: ironic |
| ironically | (adverb) in an ironic manner | - |
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| (adverb) contrary to plan or expectation | - |
| ironing | (noun) the work of using heat to smooth washed clothes in order to remove any wrinkles | - |
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| (noun) garments (clothes or linens) that are to be (or have been) ironed | - |
| ironist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ridiculer, satirist |
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| ironlike | (adjective) exhibiting strength or hardness like that of iron | - |
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| ironman | (noun) a strong man of exceptional physical endurance | Synonyms: iron man |
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| ironmonger | (noun) a store selling hardware | Synonyms: hardware store, ironmonger's shop |
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| (noun) someone who sells hardware | Synonyms: hardwareman |
| ironmongery | (noun) the merchandise that is sold in an ironmonger's shop | - |
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| irons | (noun) metal shackles; for hands or legs | Synonyms: chains |
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| ironshod | (adjective) shod or cased with iron | - |
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| ironside | (noun) a man of great strength or bravery | - |
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| ironware | (noun) instrumentalities (tools or implements) made of metal | Synonyms: hardware |
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| ironweed | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: vernonia |
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| ironwood | (noun) a small slow-growing deciduous tree of northern Iran having a low domed shape | Synonyms: iron-tree, iron tree, ironwood tree |
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| (noun) medium-sized hop hornbeam of eastern North America | Synonyms: Eastern hop hornbeam, ironwood tree, Ostrya virginiana |
| (noun) handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties | Synonyms: ironwood tree, Mesua ferrea, rose chestnut |
| (noun) exceptionally tough or hard wood of any of a number of ironwood trees | - |
| ironwork | (noun) work made of iron (gratings or rails or railings etc) | - |
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| ironworker | (noun) a person who makes articles of iron | - |
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| ironworks | (noun) the workplace where iron is smelted or where iron goods are made | - |
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| irony | (noun) incongruity between what might be expected and what actually occurs | - |
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| (noun) a trope that involves incongruity between what is expected and what occurs | - |
| (noun) witty language used to convey insults or scorn | Synonyms: caustic remark, sarcasm, satire |
| isobront | (noun) a line drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously. | - |
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| isochronal | (adjective) equal in duration or interval | Synonyms: isochronous |
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| isochrone | (noun) an isogram connecting points at which something occurs or arrives at the same time | - |
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| isochronism | (noun) the property of occuring regularly at equal time intervals, of maintaining a constant period or interval, despite variations in other measurable factors in the same system. | - |
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| isochronous | (adjective) equal in duration or interval | Synonyms: isochronal |
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| jaguarondi | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: eyra, Felis yagouaroundi, jaguarundi, jaguarundi cat |
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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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| klystron | (noun) an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation | - |
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| krona | (noun) the basic unit of money in Iceland | Synonyms: Icelandic krona |
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| (noun) the basic unit of money in Sweden | Synonyms: Swedish krona |
| krone | (noun) the basic unit of money in Denmark | Synonyms: Danish krone |
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| (noun) the basic unit of money in Norway | Synonyms: Norwegian krone |
| lakefront | (noun) land bordering a lake | - |
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| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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| lepidopteron | (noun) insect that in the adult state has four wings more or less covered with tiny scales | Synonyms: lepidopteran, lepidopterous insect |
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| linuron | (noun) a herbicide that kills weeds without harming vegetables | - |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| macaron | (noun) a sweet meringue-based confection made with egg white, icing sugar, granulated sugar, almond powder or ground almond, and food colouring. | - |
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| macaroni | (noun) pasta in the form of slender tubes | - |
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| (noun) a British dandy in the 18th century who affected Continental mannerisms | - |
| macaronic | (adjective) of or containing a mixture of Latin words and vernacular words jumbled together | - |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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| madrona | (noun) evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning | Synonyms: Arbutus menziesii, madrono, manzanita |
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| madrono | (noun) evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning | Synonyms: Arbutus menziesii, madrona, manzanita |
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| magnetron | (noun) a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators | - |
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| matron | (noun) a married woman (usually middle-aged with children) who is staid and dignified | - |
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| (noun) a woman in charge of nursing in a medical institution | - |
| (noun) a wardress in a prison | - |
| matronly | (adjective) befitting or characteristic of a fully mature woman | - |
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| matronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: metronymic |
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| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| meronym | (noun) a word that names a part of a larger whole | Synonyms: part name |
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| meronymy | (noun) the semantic relation that holds between a part and the whole | Synonyms: part to whole relation |
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| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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| methyltestosterone | (noun) an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain | - |
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| metronidazole | (noun) antiprotozoal medication (trade name Flagyl) used to treat trichomoniasis and giardiasis | Synonyms: Flagyl |
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| metronome | (noun) clicking pendulum indicates the exact tempo of a piece of music | - |
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| metronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: matronymic |
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| microelectronic | (adjective) of or relating to or consisting of miniature electronic components | - |
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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| micromicron | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: picometer, picometre |
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| micron | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micrometre |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| midiron | (noun) long iron with a nearly vertical face | Synonyms: two iron |
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| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| mispronounce | (verb) pronounce a word incorrectly | Synonyms: misspeak |
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| mispronunciation | (noun) incorrect pronunciation | - |
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| moneron | (noun) organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis | Synonyms: moneran |
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