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isomer a chemical compound that has the same kind and number of atoms as one or more other compounds, but differs from them in structural or spatial arrangement of the atoms and therefore in its properties. [2 definitions]
isomerous having an equal number of parts or markings. [2 definitions]
isometric having or displaying equal measurements or dimensions. [4 definitions]
isomorph an object, organism, compound, or set that is similar in form or appearance to another, although different in other properties, such as origin. [2 definitions]
isomorphic of different origins but similar in form and appearance, as some biological organisms. [2 definitions]
isooctane a highly flammable hydrocarbon liquid that is used as the standard to establish the octane numbers of fuels.
isopod any of various crustaceans of land, sea, or fresh water that have seven pairs of legs and a flattish body. [2 definitions]
isoprene a colorless, volatile, liquid compound distilled from raw rubber or manufactured synthetically, used mainly to make synthetic rubber.
isosceles of a two-dimensional figure with straight sides, having two equal sides.
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]