| epochal | (adjective) highly significant or important especially bringing about or marking the beginning of a new development or era | Synonyms: epoch-making |
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| eschalot | (noun) type of onion plant producing small clustered mild-flavored bulbs used as seasoning | Synonyms: Allium ascalonicum, Allium cepa aggregatum, multiplier onion, shallot |
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| exhalation | (noun) the act of expelling air from the lungs | Synonyms: breathing out, expiration |
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| (noun) exhaled breath | Synonyms: halitus |
| exhale | (verb) expel air | Synonyms: breathe out, expire |
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| (verb) give out (breath or an odor) | Synonyms: emanate, give forth |
| exomphalos | (noun) an umbilical hernia at birth in which some abdominal organs push into the umbilical cord | - |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| gildhall | (noun) the meeting place of a medieval guild | - |
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| guildhall | (noun) the hall of a guild or corporation | - |
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| halal | (adjective) conforming to Muslim dietary laws | - |
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| (adjective) proper or legitimate according to Muslim law | - |
| (noun) (Islam) meat from animals that have been slaughtered in the prescribed way according to the shariah | - |
| halberd | (noun) a pike fitted with an ax head | - |
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| halberdier | (noun) a guard who carries a halberd (as a symbol of his duty) | - |
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| halcyon | (adjective) marked by peace and prosperity | Synonyms: golden, prosperous |
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| (adjective) idyllically calm and peaceful; suggesting happy tranquillity | - |
| (noun) a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves | - |
| hale | (adjective) exhibiting or restored to vigorous good health | Synonyms: whole |
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| (verb) draw slowly or heavily | Synonyms: cart, drag, haul |
| (verb) to cause to do through pressure or necessity, by physical, moral or intellectual means | Synonyms: coerce, force, pressure, squeeze |
| haleness | (noun) a state of robust good health | Synonyms: wholeness |
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| haler | (noun) 100 halers equal 1 koruna in Czech Republic | Synonyms: heller |
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| (noun) 100 halers equal 1 koruna Slovakia | Synonyms: heller |
| half | (adjective) (of siblings) related through one parent only | - |
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| (adjective) consisting of one of two equivalent parts in value or quantity | - |
| (adjective) partial | - |
| (noun) one of two equal parts of a divisible whole | Synonyms: one-half |
| (noun) one of two divisions into which some games or performances are divided: the two divisions are separated by an interval | - |
| (adverb) partially or to the extent of a half | - |
| halfback | (noun) (American football) the position of a back on a football team, generally smaller in size than a fullback | - |
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| (noun) (football) the running back who plays the offensive halfback position | - |
| halfbeak | (noun) tropical and subtropical marine and freshwater fishes having an elongated body and long protruding lower jaw | - |
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| halfhearted | (adjective) feeling or showing little interest or enthusiasm | Synonyms: half-hearted, lukewarm, tepid |
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| halfheartedness | (noun) the characteristic of being half-hearted; not sincere; lacking full energy, effort, commitment, or resolve. | - |
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| halfpenny | (noun) an English coin worth half a penny | Synonyms: ha'penny |
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| halfpennyworth | (noun) the amount that can be bought for a halfpenny | Synonyms: ha'p'orth |
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| halftime | (noun) an intermission between the first and second half of a game | - |
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| halftone | (noun) an engraving used to reproduce an illustration | Synonyms: halftone engraving, photoengraving |
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| (noun) a print obtained from photoengraving | - |
| halfway | (adjective) equally distant from the extremes | Synonyms: center, centre, middle, midway |
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| (adjective) including only half or a portion | - |
| (adjective) at a point midway between two extremes | - |
| (adverb) at half the distance; at the middle | Synonyms: midway |
| halibut | (noun) marine food fish of the northern Atlantic or northern Pacific; the largest flatfish and one of the largest teleost fishes | Synonyms: holibut |
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| (noun) lean flesh of very large flatfish of Atlantic or Pacific | - |
| halide | (noun) a salt of any halogen acid | - |
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| halite | (noun) naturally occurring crystalline sodium chloride | Synonyms: rock salt |
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| halitosis | (noun) offensive breath | - |
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| halitus | (noun) exhaled breath | Synonyms: exhalation |
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| hall | (noun) a large building for meetings or entertainment | - |
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| (noun) a large room for gatherings, receiving guests, or entertainment | - |
| (noun) an interior passage or corridor onto which rooms open | Synonyms: hallway |
| (noun) a college or university building containing living quarters for students | Synonyms: dorm, dormitory, residence hall, student residence |
| (noun) a large entrance or reception room or area | Synonyms: antechamber, anteroom, entrance hall, foyer, lobby, vestibule |
| (noun) the large room of a manor or castle | Synonyms: manor hall |
| (noun) a large and imposing house | Synonyms: manse, mansion, mansion house, residence |
| (noun) a large building used by a college or university for teaching or research | - |
| hallah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: challah |
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| hallelujah | (noun) a shout or song of praise to God | - |
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| halliard | (noun) a rope for raising or lowering a sail or flag | Synonyms: halyard |
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| hallmark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, stylemark, trademark |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, authentication |
| halloo | (noun) a shout to attract attention | - |
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| (verb) shout `halloo', as when greeting someone or attracting attention | - |
| (verb) urge on with shouts | - |
| hallow | (verb) render holy by means of religious rites | Synonyms: bless, consecrate, sanctify |
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| hallowed | (adjective) worthy of religious veneration | Synonyms: sacred |
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| hallstand | (noun) a piece of furniture where coats and hats and umbrellas can be hung; usually has a mirror | - |
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| hallucinate | (verb) perceive what is not there; have illusions | - |
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| hallucinating | (adjective) experiencing delirium | Synonyms: delirious |
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| hallucination | (noun) a mistaken or unfounded opinion or idea | Synonyms: delusion |
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| (noun) an object perceived during a hallucinatory episode | - |
| (noun) illusory perception; a common symptom of severe mental disorder | - |
| hallucinatory | (adjective) characterized by or characteristic of hallucination | - |
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| hallucinogen | (noun) a psychoactive drug that induces hallucinations or altered sensory experiences | Synonyms: hallucinogenic drug, psychedelic drug, psychodelic drug |
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| hallucinogenic | (adjective) capable of producing hallucinations | - |
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| hallucinosis | (noun) a mental state in which the person has continual hallucinations | - |
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| hallux | (noun) the first largest innermost toe | Synonyms: big toe, great toe |
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| hallway | (noun) an interior passage or corridor onto which rooms open | Synonyms: hall |
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| halm | (noun) stems of beans and peas and potatoes and grasses collectively as used for thatching and bedding | Synonyms: haulm |
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| halma | (noun) a board game in which players try to move their pieces into their opponent's bases | - |
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| halo | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, nimbus |
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| (noun) a circle of light around the sun or moon | - |
| (noun) a toroidal shape | Synonyms: anchor ring, annulus, doughnut, ring |
| haloalkane | (noun) organic compound in which halogen atoms have been substituted for hydrogen atoms in an alkane | Synonyms: alkyl halide |
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| halobacter | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacteria, halobacterium |
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| halobacteria | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacterium |
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| halobacterium | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacteria |
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| halocarbon | (noun) one of various compounds of carbon and any of the halogens | - |
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| haloform | (noun) compounds with the formula CHX3, where X is a halogen atom | - |
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| halogen | (noun) any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions | - |
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| halogeton | (noun) a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content | Synonyms: Halogeton glomeratus |
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| halon | (noun) a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms; very stable; used in fire extinguishers although it is thought to release bromine that depletes the ozone layer | - |
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| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| halophil | (noun) archaebacteria requiring a salt-rich environment for growth and survival | Synonyms: halophile |
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| halophile | (noun) archaebacteria requiring a salt-rich environment for growth and survival | Synonyms: halophil |
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| halophyte | (noun) plant growing naturally in very salty soil | - |
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| halothane | (noun) a nonflammable inhalation anesthetic that produces general anesthesia; used along with analgesics and muscle relaxants for many types of surgical procedures | - |
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| halt | (adjective) disabled in the feet or legs | Synonyms: crippled, game, gimpy, halting, lame |
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| (noun) an interruption or temporary suspension of progress or movement | Synonyms: freeze |
| (noun) the event of something ending | Synonyms: stop |
| (noun) the state of inactivity following an interruption | Synonyms: arrest, check, hitch, stay, stop, stoppage |
| (verb) stop the flow of a liquid | Synonyms: stanch, staunch, stem |
| (verb) come to a halt, stop moving | Synonyms: stop |
| (verb) cause to come to an abrupt stop | Synonyms: arrest, hold |
| (verb) stop from happening or developing | Synonyms: block, kibosh, stop |
| halter | (noun) either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight | Synonyms: balancer, haltere |
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| (noun) a woman's top that fastens behind the back and neck leaving the back and arms uncovered | - |
| (noun) rope or canvas headgear for a horse, with a rope for leading | Synonyms: hackamore |
| (noun) a rope that is used by a hangman to execute persons who have been condemned to death by hanging | Synonyms: hangman's halter, hangman's rope, hemp, hempen necktie |
| (verb) prevent the progress or free movement of | Synonyms: cramp, hamper, strangle |
| (verb) hang with a halter | - |
| haltere | (noun) either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight | Synonyms: balancer, halter |
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| halting | (adjective) fragmentary or halting from emotional strain | - |
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| (adjective) disabled in the feet or legs | Synonyms: crippled, game, gimpy, halt, lame |
| haltingly | (adverb) in a halting manner | - |
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| halve | (verb) divide by two; divide into halves | - |
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| halyard | (noun) a rope for raising or lowering a sail or flag | Synonyms: halliard |
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| hierarchal | (adjective) classified according to various criteria into successive levels or layers | Synonyms: hierarchic, hierarchical |
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| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| holocephalian | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalan |
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| hydrocephalic | (adjective) relating to or characterized by or evidencing hydrocephalus | - |
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| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| hypothalamic | (adjective) of or relating to the hypothalamus | - |
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| hypothalamically | (adverb) with respect to the hypothalamus | - |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| inhalant | (adjective) inhaling or serving for inhalation | - |
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| (noun) a medication to be taken by inhaling it | Synonyms: inhalation |
| (noun) something that is inhaled | - |
| inhalation | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: aspiration, breathing in, inspiration, intake |
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| (noun) a medication to be taken by inhaling it | Synonyms: inhalant |
| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
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| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| inhale | (verb) draw in (air) | Synonyms: breathe in, inspire |
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| (verb) draw deep into the lungs in by breathing | - |
| inhaler | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhalator |
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| isochalaz | (noun) a line indicating a constant frequency of hail storms. | - |
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| khalif | (noun) the civil and religious leader of a Muslim state considered to be a representative of Allah on earth | Synonyms: calif, caliph, kalif, kaliph, khalifah |
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| khalifah | (noun) the civil and religious leader of a Muslim state considered to be a representative of Allah on earth | Synonyms: calif, caliph, kalif, kaliph, khalif |
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| lagophthalmos | (noun) abnormal condition in which an eye cannot close completely | - |
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| lauhala | (noun) Polynesian screw pine | Synonyms: Pandanus tectorius, textile screw pine |
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| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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| lethal | (adjective) of an instrument of certain death | Synonyms: deadly |
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| lethality | (noun) the quality of being deadly | Synonyms: deadliness |
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| leukoencephalitis | (noun) inflammation of the white matter of the brain | - |
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| macrencephalic | (adjective) having a large brain case | Synonyms: macrencephalous |
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| macrencephalous | (adjective) having a large brain case | Synonyms: macrencephalic |
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| macrencephaly | (noun) an abnormally large braincase | - |
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| macrocephalic | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalous |
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| macrocephalous | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalic |
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