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isosceles triangle a triangle with two sides that are equal in length.
isotherm a line on a weather map or chart that connects all points on the earth's surface that have the same average temperature over a specified period, or the same temperature at a given time.
isothermal of, related to, or designating equal temperatures or changes occurring at constant temperatures. [3 definitions]
isotonic equal in tension. [2 definitions]
isotope any of two or more atoms that have the same number of protons but differ in the number of neutrons, or that have the same atomic number but different atomic weights. (Cf. isobar.)
isotropic having physical properties, such as heat conductivity or growth, that are the same along any axis of measurement.
Israel a Middle Eastern republic, formed as a Jewish state by action of the United Nations in 1948. [2 definitions]
Israeli a native or citizen of modern Israel. [2 definitions]
Israelite a member of the Hebrew people, esp. of Biblical times. [2 definitions]
Issei (sometimes l.c.) a first-generation Japanese immigrant to the United States or Canada. (See Kibei, Nisei, Sansei.)
issuance the act or process of issuing.
issue the act or process of sending or coming from a particular source. [10 definitions]
issueless combined form of issue.
-ist one who does, makes, or handles. [3 definitions]
Istanbul a Turkish city at the entrance to the Black Sea; formerly Byzantium and Constantinople.
isthmian of or relating to an isthmus. [3 definitions]
isthmus a narrow strip of land connecting two larger land masses and bordered on its long sides by water. [2 definitions]
-istic of, relating to, or having the characteristics of.
istle a fiber from any of various tropical American plants such as agave and yucca, used for cords, nets, carpets, and the like.
it used to indicate an animal, abstract thing, group, inanimate object, or being of undetermined gender that has been mentioned or is about to be mentioned. [6 definitions]
itai-itai disease a painful degenerative bone disease contracted by ingesting water or food that has been polluted by industrial cadmium waste.