| hygienic | (adjective) tending to promote or preserve health | Synonyms: hygienical |
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| hygrophytic | (adjective) requiring an abundance of moisture | - |
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| hygroscopic | (adjective) absorbing moisture (as from the air) | - |
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| hyperbolic | (adjective) of or relating to a hyperbola | - |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: inflated |
| hypercatalectic | (adjective) (verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot | - |
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| hyperemic | (adjective) relating to or caused by hyperemia | - |
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| hypermetropic | (adjective) abnormal ability to focus of distant objects | Synonyms: hyperopic |
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| hyperopic | (adjective) abnormal ability to focus of distant objects | Synonyms: hypermetropic |
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| hypertonic | (adjective) (of a solution) having a higher osmotic pressure than a comparison solution | - |
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| (adjective) (of living tissue) in a state of abnormally high tension | - |
| hypnagogic | (adjective) sleep inducing | Synonyms: hypnogogic, somniferous, somnific, soporiferous, soporific |
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| hypnogogic | (adjective) sleep inducing | Synonyms: hypnagogic, somniferous, somnific, soporiferous, soporific |
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| hypnotic | (adjective) of or relating to hypnosis | - |
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| (adjective) attracting and holding interest as if by a spell | Synonyms: mesmeric, mesmerizing, spellbinding |
| hypodermic | (adjective) relating to or located below the epidermis | Synonyms: subcutaneous |
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| hypoglycaemic | (adjective) of or relating to hypoglycemia | Synonyms: hypoglycemic |
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| hypoglycemic | (adjective) of or relating to hypoglycemia | Synonyms: hypoglycaemic |
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| hypothalamic | (adjective) of or relating to the hypothalamus | - |
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| hypothermic | (adjective) of or relating to or affected by hypothermia | - |
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| hypothetic | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetical, supposed, suppositional, suppositious, supposititious |
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| hypotonic | (adjective) (of a solution) having a lower osmotic pressure than a comparison solution | - |
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| (adjective) (of living tissue) lacking normal tone or tension | - |
| hypovolaemic | (adjective) of or relating to a decrease in the volume of circulating blood | Synonyms: hypovolemic |
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| hypovolemic | (adjective) of or relating to a decrease in the volume of circulating blood | Synonyms: hypovolaemic |
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| hysteric | (adjective) characterized by or arising from psychoneurotic hysteria | Synonyms: hysterical |
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| iambic | (adjective) of or consisting of iambs | - |
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| iatrogenic | (adjective) induced by a physician's words or therapy (used especially of a complication resulting from treatment) | - |
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| ic | (adjective) being one less than one hundred and nine more than ninety | Synonyms: 99, ninety-nine |
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| iconic | (adjective) relating to or having the characteristics of an icon | - |
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| iconoclastic | (adjective) destructive of images used in religious worship; said of religions, such as Islam, in which the representation of living things is prohibited | - |
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| (adjective) characterized by attack on established beliefs or institutions | - |
| icteric | (adjective) affected by jaundice which causes yellowing of skin etc | Synonyms: jaundiced, yellow |
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| icterogenic | (adjective) producing jaundice | - |
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| ictic | (adjective) of or relating to a seizure or convulsion | Synonyms: ictal |
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| idealistic | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: ideal |
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| (adjective) of high moral or intellectual value; elevated in nature or style | Synonyms: elevated, exalted, grand, high-flown, high-minded, lofty, noble-minded, rarefied, rarified, sublime |
| ideographic | (adjective) of or relating to or consisting of ideograms | - |
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| ideologic | (adjective) concerned with or suggestive of ideas | Synonyms: ideological |
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| idiographic | (adjective) relating to or involving the study of individuals | - |
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| idiomatic | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatical |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| idiosyncratic | (adjective) peculiar to the individual | - |
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| idiotic | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) insanely irresponsible | Synonyms: crackbrained |
| (adjective) having a mental age of three to seven years | Synonyms: imbecile, imbecilic |
| idyllic | (adjective) excellent and delightful in all respects | - |
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| (adjective) suggestive of an idyll; charmingly simple and serene | - |
| imbecilic | (adjective) having a mental age of three to seven years | Synonyms: idiotic, imbecile |
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| immunogenic | (adjective) possessing the ability to elicit an immune response | - |
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| immunologic | (adjective) of or relating to immunology | Synonyms: immunological |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| impolitic | (adjective) not politic | - |
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| impressionistic | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionist |
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| (adjective) of or relating to or based on an impression rather than on facts or reasoning | - |
| inaesthetic | (adjective) violating aesthetic canons or requirements; deficient in tastefulness or beauty | Synonyms: unaesthetic |
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| inartistic | (adjective) lacking aesthetic sensibility | Synonyms: unartistic |
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| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| individualistic | (adjective) with minimally restricted freedom in commerce | Synonyms: laissez-faire |
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| (adjective) marked by or expressing individuality | Synonyms: individualist |
| inelastic | (adjective) not elastic | - |
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| infrasonic | (adjective) having frequencies below those of audible sound | - |
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| inharmonic | (adjective) lacking in harmony | Synonyms: discordant, disharmonious, dissonant |
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| inorganic | (adjective) relating or belonging to the class of compounds not having a carbon basis | - |
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| (adjective) lacking the properties characteristic of living organisms | - |
| intergalactic | (adjective) between or among galaxies | - |
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| internationalistic | (adjective) influenced by or advocating internationalism | Synonyms: internationalist |
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| interscholastic | (adjective) used of competition or cooperation between secondary schools | Synonyms: interschool |
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| interspecific | (adjective) arising or occurring between species | Synonyms: interspecies |
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| intradermic | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermal |
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| intralinguistic | (adjective) within a particular language | - |
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| intraspecific | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecies |
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| intrinsic | (adjective) belonging to a thing by its very nature | Synonyms: intrinsical |
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| (adjective) situated within or belonging solely to the organ or body part on which it acts | - |
| ionic | (adjective) containing or involving or occurring in the form of ions | - |
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| irenic | (adjective) conducive to peace | - |
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| iridic | (adjective) of or relating to the iris of the eye | - |
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| (adjective) of or containing iridium | - |
| iritic | (adjective) of or relating to located near the iris of the eye | - |
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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 |
| ischaemic | (adjective) relating to or affected by ischemia | Synonyms: ischemic |
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| ischemic | (adjective) relating to or affected by ischemia | Synonyms: ischaemic |
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| isentropic | (adjective) with unchanging entropy; at constant entropy | - |
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| isoclinic | (adjective) having equal magnetic inclinations | Synonyms: isoclinal |
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| isocyclic | (adjective) containing a closed ring of atoms of the same kind especially carbon atoms | Synonyms: homocyclic |
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| isogonic | (adjective) having or making equal angles | - |
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| isolationistic | (adjective) of or relating to isolationism | Synonyms: isolationist |
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| isomeric | (adjective) of or relating to or exhibiting isomerism | - |
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| isometric | (adjective) of or involving muscular contraction in which tension increases while length remains constant | - |
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| (adjective) related by an isometry | - |
| (adjective) of a crystal system characterized by three equal axes at right angles | - |
| (adjective) having equal dimensions or measurements | Synonyms: isometrical |
| isomorphic | (adjective) having similar appearance but genetically different | Synonyms: isomorphous |
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| isosmotic | (adjective) (used of solutions) having the same or equal osmotic pressure | Synonyms: isotonic |
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| isothermic | (adjective) of or relating to an isotherm | - |
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| isotonic | (adjective) (used of solutions) having the same or equal osmotic pressure | Synonyms: isosmotic |
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| (adjective) of or involving muscular contraction in which tension is constant while length changes | - |
| (adjective) relating to or characterized by the equal intervals of a musical scale | - |
| (adjective) of two or more muscles; having equal tension | - |
| isotopic | (adjective) of or relating to or having the relation of an isotope | - |
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| isotropic | (adjective) invariant with respect to direction | Synonyms: isotropous |
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| italic | (adjective) characterized by slanting characters | - |
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| jingoistic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, nationalistic, superpatriotic, ultranationalistic |
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| journalistic | (adjective) of or relating to or having the characteristics of journalism | - |
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| juridic | (adjective) relating to the administration of justice or the function of a judge | Synonyms: judicial, juridical |
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| (adjective) of or relating to the law or jurisprudence | Synonyms: juridical |
| juristic | (adjective) of or relating to law or to legal rights and obligations | Synonyms: jural |
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| kabbalistic | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, qabalistic, sibylline |
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| kaleidoscopic | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopical |
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| karyokinetic | (adjective) of or relating to the division of the nucleus of a cell during mitosis or meiosis | - |
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| katabatic | (adjective) of an air current or wind; moving downward or down a slope because of cooling especially at night | Synonyms: catabatic |
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| katabolic | (adjective) characterized by destructive metabolism | Synonyms: catabolic |
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| (adjective) relating to or characterized by catabolism | Synonyms: catabolic |
| katharobic | (adjective) of living being in an oxygenated environment lacking organic matter | - |
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| kinaesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinesthetic |
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| kinesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinaesthetic |
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| kinetic | (adjective) relating to the motion of material bodies and the forces associated therewith | - |
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| (adjective) supplying motive force | Synonyms: energising, energizing |
| (adjective) characterized by motion | - |
| kyphotic | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, hunchbacked |
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| laconic | (adjective) brief and to the point; effectively cut short | Synonyms: crisp, curt, terse |
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| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| lactogenic | (adjective) inducing lactation | - |
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