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- HYPERBATONAn inversion of the usual or logical order of words or phrases, for emphasis or poetic effect.
- HYPERBOLAA conic section formed by the intersection of a cone with a plane that intersects the base of the cone and is not tangent to the cone. The function y(x) = 1/x draws a hyperbola.
- HYPERBOLEDeliberate overstatement, particularly extreme overstatement.
- HYPERBOLICOf or relating to hyperbole.
- HYPERCATALEXISThe addition of one or two syllables to the last foot of a verse
- HYPERDULIAA level of veneration higher than dulia but less than latria, properly given to the Virgin Mary only.
- HYPEREMIAexcess of blood in a body part.
- HYPERICUMAny of many flowering plants of the genus Hypericum, St. John's worts.
- HYPERINOTICRelating to hyperinosis.
- HYPERTONIAAn abnormal increase in tightness of muscle tone, common in cerebral palsy.
- HYPHAAny of the long, threadlike filaments that form the mycelium of a fungus.
- HYPNOTICOf or relating to hypnosis or hypnotism.
- HYPOMelancholy; a fit of hypochondria; a morbid depression.
- HYPOBOLEA rhetorical figure in which several things are mentioned that seem to make claims against the argument, or in favor of the opposing side, but are then refuted one by one.
- HYPOCAUSTAn underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
- HYPOCENTREThe focus of an earthquake, directly under the epicentre.
- HYPOCISTAn astringent inspissated juice obtained from the fruit of a plant
- HYPOCORISMA term of endearment, often a diminutive; a pet name.
- HYPOCRITESomeone who practices hypocrisy, who pretends to hold beliefs, or whose actions are not consistent with their claimed beliefs.
- HYPOGEALExisting or growing underground
- HYPOGEANExisting or growing underground.
- HYPOGEOUSLiving or maturing underground; subterranean
- HYPOGEUMAn underground room or cavern .
- HYPONASTICBending upwards as a result of hyponasty, caused by unequal growth.
- HYPOPHYSISThe pituitary gland.
- HYPOSMIAA reduced ability to smell and to detect odors.
- HYPOSTATICPertaining to hypostasis, especially with reference to hypostatic union.
- HYPOTENUSEThe side of a right triangle opposite the right angle.
- HYPOTONIAA state of reduced pressure of the intraocular fluid.
- HYPURALUnder the tail
- HYRAXAny of several small, paenungulate herbivorous mammals of the family Procaviidae from the order Hyracoidea, with a bulky frame and fang-like incisors, native to Africa and the Midd
- HYSSOPAny of several aromatic bushy herbs, of the genus Hyssopus, native to Southern Europe and once used medicinally.
- HYSTERIABehavior exhibiting excessive or uncontrollable emotions, in a wide range from joy to panic but usually including anxiety or fear.
- HYSTERICHysterical; relating to hysteria.
- HYSTERICALOf, or arising from hysteria.
- IAMBA metrical foot in verse consisting of an unstressed syllable followed by a stressed syllable.
- IAMBICConsisting of iambs (metrical feet with an unstressed–stressed pattern) or characterized by their predominance.
- IAMBUSSynonym of iamb.
- IATRICOf or pertaining to a physician or physicians.
- IBISAny of various long-legged wading birds in the family Threskiornithidae, having long downcurved bills used to probe the mud for prey such as crustaceans.
- ICONAn image, symbol, picture, portrait, or other representation, usually as an object of religious devotion.
- ICONICRelating to, or having the characteristics of, an icon.
- ICOSAHEDRONA polyhedron with twenty faces.
- ICTERUSAn excess of bile pigments in the blood; jaundice.
- IDENTITYSameness, identicalness; the quality or fact of (several specified things) being the same.
- IDIOMA manner of speaking, a mode of expression peculiar to a language, language family, or group of people.
- IDIOPATHYA disease or condition arising spontaneously or having no known cause.
- IDIOTA person of low general intelligence.
- IDOLATRYThe worship of idols.
- IDYLLAny poem or short written piece composed in the style of Theocritus's short pastoral poems, the Idylls.
- ILEUSDisruption of the normal propulsive ability of the gastrointestinal tract, due to failure of peristalsis.
- IMPEDa creature without feet
- INDIGOA purplish-blue color.
- INOSITEFormer name of inositol.
- INOSITOLA simple carbocyclic sugar (hexahydroxycyclohexane; chemical formula: C6H12O6) which occurs in animal and plant tissue. Once treated as part of the vitamin B complex, but is not a
- INOTROPICIncreasing or decreasing the force of muscular contractions.
- INSECTAn arthropod (in the Insecta class) characterized by six legs, up to four wings, and a chitinous exoskeleton.
- IODINEA chemical element (symbol: I) with an atomic number of 53; one of the halogens.
- IOLITEThe clear variety of cordierite, sometimes used as a gem.
- IOTAThe ninth letter of the Greek alphabet (Ι, ι).
- IOTACISMPronunciation of another vowel or diphthong as [i], or a vowel shift resulting in such pronunciation, especially in Greek.
- IRENOLOGYThe study of peace.
- IRIDALPertaining to a rainbow.
- IRONICCharacterized by or constituting (any kind of) irony.
- IRONYThe quality of a statement that, when taken in context, may actually mean something different from, or the opposite of, what is written literally; the use of words expressing somet
- ISCHEMIALocal disturbance in blood circulation due to mechanical obstruction of the blood supply (for example, embolism, thrombosis, or vasoconstriction).
- ISCHIUMThe lowest of the three bones that make up each side of the pelvis.
- ISOBARA line drawn on a map or chart connecting places of equal or constant pressure.
- ISOBATHA line on a map or chart joining places of equal depth of water; a depth contour.
- ISOCHEIMAn isotherm connecting points on a map with equal mean winter temperature.
- ISOCHOREIn general, a place or position with relevant parameters matching other places, as in having the same pressure, chemistry, population etc. Even within a single discipline the param
- ISOCHRONALHaving the same duration.
- ISODYNAMICHaving equal strength or force.
- ISOHELA line on a map connecting places that receive equal solar radiation, or equal daily hours of sunshine.
- ISOHYETA line of equal rainfall on a map or chart, such as a weather map.
- ISOKONTHaving flagella of equal length.
- ISOMETRYA function between metric spaces (or on a single metric space) having the property that the distance between two images is equal to the distance between their preimages.
- ISONOMYAlternative form of isonomia.
- ISOPACHA line on a chart joining parts of a stratigraphic unit that have the same thickness; an isopachous line.
- ISOPLETHA line drawn on a map through all points having the same value of some measurable quantity.
- ISOPOLITYEqual rights of citizenship in different communities; mutual political rights.
- ISOTACHAn isoline linking places on a map which have equal wind speed.
- ISOTHERMA line on a graph or chart, such as a weather map, along which all the points have the same temperature.
- ISOTROPICHaving properties that are identical in all directions; exhibiting isotropy
- ISTHMUSA narrow strip of land, bordered on both sides by water, and connecting two larger landmasses.
- JACINTHA translucent, reddish type of zircon used as a gemstone; a hyacinth.
- JAMBEither of the vertical components that form the side of an opening in a wall, such as that of a door frame, window frame, or fireplace.
- JASPERAny bright-coloured kind of chalcedony apart from cornelian.
- JEALOUSSuspecting rivalry in love; troubled by worries that one might have been replaced in someone's affections; suspicious of a lover's or spouse's fidelity.
- JUBEA type of gelatine-based confection; its ingredients and consistency vary between countries.
- JYNXA bird, the wryneck, once thought a bird of ill omen (Jynx torquilla).
- JYNXESA bird, the wryneck, once thought a bird of ill omen (Jynx torquilla).
- KALEIDOSCOPEAn instrument consisting of a tube containing mirrors and loose, colourful beads or other objects; when the tube is looked into and rotated, a succession of symmetrical designs can
- KALPISA kind of Ancient Greek water jug.
- KAMACITEA meteoritic mineral which consists chiefly of iron and nickel
- KAPPAThe tenth letter of the Greek alphabet.
- KARYONThe nucleus of a cell.
- KELOIDA hard raised growth of scar tissue at the site of an injury.
- KENOPHOBIAAn abnormal fear of empty spaces.
- KENOPHOBIASAn abnormal fear of empty spaces.