Word origins

• iconotypeAn illustration of a biological specimen that serves as a holotype or lectotype (type specimen and it becomes the type illustration). It is not an illustration of a holotype or lectotype. In the 18th and early 19th century, iconotypes were designated as type specimens when preserved specimens were not available. In the 21st century, iconotypes are being used where a live animal is recorded and then released.
• icosagonA polygon with twenty sides and twenty angles.
• icosihenagonA polygon with twenty-one edges and twenty-one angles.
• icositetrachoronA four-dimensional object with no regular three-dimensional analogue, constructed out of twenty-four octahedra.
• ideasthesiaA neurological or cognitive phenomenon in which activation of a particular concept triggers a sensory-like experience.
• ideo-Idea, image.
• idio-individuality, peculiarity, separateness.
• idiomelonA type of sticheron found in the liturgical books used in Orthodox Christianity.
• -idionUsed to form diminutive nouns.
• idiosomaThe posterior portion of the body of a mite.
• -idiumreproductive organs, gametes, and early life stages
• ilinxA form of play that creates a temporary disruption of perception, for example by inducing vertigo, dizziness, disorientation, or frenzy.
• Imbrosisland of Turkey in the north-eastern Aegean Sea
• iniencephalyA cephalic disorder characterized by spina bifida and spinal retroflexion
• inogenA complex nitrogenous substance formerly hypothesized to be continually decomposed and reproduced in the muscles during life.
• inosilicateany silicate having interlocking chains of silicate tetrahedra
• interhyalOf or pertaining to a segment sometimes present at the proximal end of the hyoid arch.
• iodo-Containing iodine.
• -ionAn action or process, or the result of an action or process.
• -iotOf or relating to an island or peninsula in Greece or the Hellenic sphere.
• iotationA specific occurrence of palatalization that occurred in the Proto-Slavic language, in which a consonant combined with the palatal approximant /j/ to form a palatalized consonant.
• irenicPromoting or fitted to promote peace or peacemaking, especially over disputes; conciliatory, non-confrontational, peaceful.
• irenologyThe study of peace.
• iridencleisisA surgical procedure for glaucoma in which a portion of the iris is incised and incarcerated in a limbal incision.
• IrminonesA large group of early Germanic tribes who settled in the Elbe watershed and by the 1st century AD had expanded into Bavaria, Swabia and Bohemia.
• irmologionA liturgical book containing irmoi for the various canons chanted during the morning service.
• ironismA state of doubt regarding one's own "vocabulary" (set of communicative beliefs) that cannot be removed by making arguments in that vocabulary.
• Isauriaa rugged isolated district in the interior of South Asia Minor; famous for its bandits
• ischidrosisAnhidrosis, the suppression or retention of sweating.
• ischio-ischium
• ischiopagusOne of a pair of conjoined twins who are united at the pelvis.
• isegoriaequality of all citizens in freedom of speech, specially in public assemblies.
• IslamomisiaHatred of Islam or Muslims.
• -ismUsed to form nouns of action, process, or result based on the accompanying verb ending in -ise or -ize.
• isochasmA line connecting places on the Earth's surface that have the same mean frequency of auroras.
• 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 parameter might vary according to convenience e.g. in physics alone it might refer to velocity, volume, gravity, and many more. cf. contour, isopleth.
• isochronalHaving the same duration.
• isochronyThe state of being isochronous.
• isochroousOf uniform color; isochromatic.
• isocoriaThe condition of having the pupils of both eyes the same size
• isocrymeAn isoline connecting points on the Earth's surface having the same mean temperature in the coldest month of the year.
• IsodiconIn the Greek Orthodox Church, a troparion or short anthem sung while the Gospel is being carried through the church.
• isodynAn isoline connecting places at which an equal amount of wind power is available near ground level on average.
• isoglossA line on a map indicating the geographical boundaries of a linguistic feature.
• isohalsineAn isohaline.
• isohelA line on a map connecting places that receive equal solar radiation, or equal daily hours of sunshine.
• isokontHaving flagella of equal length.
• isonephAn isoline indicating equal cloud cover.
• isonomicThe same, or equal, in law or right; one in kind or origin; analogous or similar.
• isopachA line on a chart joining parts of a stratigraphic unit that have the same thickness; an isopachous line.
• isopiesticHaving equal pressure; isobaric.
• isoplethA line drawn on a map through all points having the same value of some measurable quantity.
• isopractAn isoline.
• isopycnicOf points on a surface, or in a medium: having equal density.
• isostasyThe state of balance or pressure equilibrium thought to exist within the Earth's crust, whereby the upper lithosphere floats on denser magma beneath.
• isostemonousHaving the same number of stamens as petals.
• isosthenuriaThe excretion of urine whose specific gravity (concentration) is neither greater nor less than that of protein-free plasma.
• isotherombroseAn isoline connecting points on the Earth's surface that have the same mean summer rainfall.
• isotomicHaving equal but reflected cevians.
• -isyUsed to form nouns denoting condition, action, or process.
• ItalioteA member of the Greek-speaking peoples of southern Italy before Roman times.
• ithycyphosisA form of kyphosis (excessive outward curvature of the spine) with a localized, backward projection of the spine while the surrounding vertebral column remains straight.
• ithyphallophobiaThe fear of having or seeing an erect penis.
• Judas IscariotA betrayer.
• JudeomisiaHatred of Judaism or Jews.
• JudeomisicHating Jewish people; prejudiced against Jews.
• juxtacrineIn direct contact, especially of one cell with another.
• kairineA derivative of tetrahydro-quinoline (C₁₀H₁₃NO), formerly used as an antipyretic.
• kakistocracyGovernment under the control of a nation's worst or least-qualified citizens.
• kakistocratA very ill-qualified ruler; a member of a kakistocracy.
• kakocracyRule or government by the worst of the people.
• kaleidographA late 19th or early 20th century device for duplicating documents that use colored ink, consisting of a tray with a rubbery substance that takes an impression of the document and then transfers it onto blank sheets of paper.
• KallipolisThe utopian city state ruled by philosopher kings as theorised by Plato in the Republic.
• kalologyThe study of beauty; aesthetics
• kalopsiaThe delusion of things being more beautiful than they are.
• kamaciteA meteoritic mineral which consists chiefly of iron and nickel
• kamelaukionA stiff brimless ornamental cap worn in Orthodox Christian and Eastern Catholic traditions.
• kamptuliconA kind of elastic floorcloth, made of India rubber, gutta-percha, linseed oil, and powdered cork.
• karyo-relating to the nucleus of cells
• karyologyThe study of the nuclei of cells, especially with regard to the chromosomes which they contain.
• karyonThe nucleus of a cell.
• katabasisA mytheme or trope in which the hero embarks on a journey to the underworld.
• katalIn the International System of Units, the derived unit of catalytic activity; one mole per second. Symbol: kat.
• kata thermometerA device consisting principally of an alcohol thermometer, used to measure air cooling power and, indirectly, small wind speeds in circulating air, by measuring the time taken for the temperature of the bulb of alcohol to make a specified drop (100° to 95°F).
• katelectrotonusThe condition of increased irritability of a nerve in the region of the negative electrode or cathode on the passage of a current of electricity through it.
• katharometerA device used for analyzing gas mixtures by measuring their thermal conductivity.
• kathenotheismBelief that multiple deities exist, and different deities are supreme among them at different times.
• kathetalMaking a right angle; perpendicular
• kathisophobiaThe irrational fear of sitting down.
• kato-downwards, below
• katoptriteA monoclinic-prismatic mineral containing aluminum, antimony, iron, magnesium, manganese, oxygen, and silicon.
• kellionA small group of monks.
• KeltoiThe Celts.
• kenophobiaAn abnormal fear of empty spaces.
• kenopsiaThe haunting quality of seeing a location typically full of people in a state of emptiness or abandonment.
• kenosisChrist's voluntary abasement consisting of humanity and the simultaneous occultation of the Divinity.
• kenotronA kind of vacuum rectifier, used for the power supply in X-ray equipment.
• kentroliteAn orthorhombic-dipyramidal mineral containing aluminum, iron, lead, magnesium, manganese, oxygen, silicon, and titanium.
• kephaleA local or provincial governor in the late Byzantine Empire.