| azimuthal | (adjective) of or relating to or in azimuth | - |
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| benthal | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthic, benthonic |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| bismuthal | (adjective) of or relating to bismuth | - |
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| breathalyse | (verb) test someone's alcohol level in his blood by means of a breathalyzer | Synonyms: breathalyze |
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| breathalyser | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyzer |
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| breathalyze | (verb) test someone's alcohol level in his blood by means of a breathalyzer | Synonyms: breathalyse |
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| breathalyzer | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyser |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| enthalpy | (noun) (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure | Synonyms: H, heat content, total heat |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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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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| lagophthalmos | (noun) abnormal condition in which an eye cannot close completely | - |
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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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| nanophthalmos | (noun) condition in which both eyes are abnormally small but otherwise normal | - |
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| naphthalene | (noun) a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs | - |
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| neanderthal | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, oafish, swinish |
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| nonlethal | (adjective) not capable of causing death | - |
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| ophthalmectomy | (noun) surgical removal of an eye | - |
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| ophthalmia | (noun) severe conjunctivitis | Synonyms: ophthalmitis |
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| ophthalmic | (adjective) of or relating to ophthalmology | - |
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| (adjective) of or relating to or resembling the eye | Synonyms: ocular, optic, optical |
| ophthalmitis | (noun) severe conjunctivitis | Synonyms: ophthalmia |
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| ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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| ophthalmology | (noun) the branch of medicine concerned with the eye and its diseases | - |
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| ophthalmoplegia | (noun) paralysis of the motor nerves of the eye | - |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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| phenolphthalein | (noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| prothalamion | (noun) a song in celebration of a marriage | Synonyms: prothalamium |
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| prothalamium | (noun) a song in celebration of a marriage | Synonyms: prothalamion |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| subthalamus | (noun) the ventral part of the thalamus | - |
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| thalamocortical | (adjective) relating to or connecting the cortex and thalamus | - |
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| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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| thalassemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassaemia |
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| thalassic | (adjective) relating to the seas, especially smaller or inland seas | - |
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| thalidomide | (noun) a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis | - |
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| thallium | (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores | Synonyms: atomic number 81, Tl |
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| thalloid | (adjective) of or relating to or resembling or consisting of a thallus | - |
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| thallophyte | (noun) any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf | - |
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| thallophytic | (adjective) pertaining to or characteristic of thallophytes | - |
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| thallus | (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes | - |
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| thalmencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, interbrain |
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| thalweg | (noun) a line following the lowest points of a valley | - |
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| (noun) the middle of the chief navigable channel of a waterway that forms the boundary line between states | - |
| therewithal | (adverb) together with all that; besides | - |
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| wherewithal | (noun) the necessary means (especially financial means) | - |
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| withal | (adverb) together with this | - |
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| (adverb) despite anything to the contrary (usually preceding a concession) | Synonyms: all the same, at the same time, even so, however, nevertheless, nonetheless, notwithstanding, still, yet |
| xerophthalmia | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmus |
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| xerophthalmus | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmia |
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| zenithal | (adjective) relating to or located at or near the zenith | - |
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