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io moth a large North American moth with prominent eyespots on each hind wing.
-ion process; act; action. [3 definitions]
ion an atom, group of atoms, or molecule that bears a positive electric charge as a result of electron loss or a negative charge as a result of electron gain. [2 definitions]
ion exchange the interchange of ions between a solid and a fluid, a process often used in water softening.
Ionia a region along the Aegean Sea of western Asia Minor (present day Turkey) colonized by ancient Greeks. [2 definitions]
Ionian of or pertaining to Ionia, a region along the Aegean Sea of western Asia Minor (present day Turkey) colonized by Ancient Greeks. [2 definitions]
Ionic of or pertaining to a region of ancient Greece in coastal Asia Minor and adjacent Aegean islands or its people, culture, language, or the like. [3 definitions]
ionic of, pertaining to, or in the form of ions.
ionium a naturally occurring radioactive isotope of the chemical element thorium.
ionization chamber a gas-filled vessel fitted with two electrodes in which the current between the electrodes is a function of the amount of ionization of the gas.
ionize to separate or change partly or completely into ions. [3 definitions]
ionosphere layers of the earth's atmosphere located above the stratosphere from about thirty to two hundred and fifty miles above the earth's surface, and composed of rarefied gases that have been ionized by radiation from the sun.
iota the name of the ninth letter of the Greek alphabet. [2 definitions]
IOU a signed paper acknowledging a debt and often bearing these letters, meaning "I owe you".
-ious full of; having the characteristics of; having.
Iowa a Midwestern U.S. state between Illinois and Nebraska. (abbr.: IA) [3 definitions]
IP in computing, an abbreviation for Internet protocol, one of the main Internet communications protocols, which specifies the format of transmitted data and routing information.
iPad trademark for a tablet computer developed and sold by Apple, Inc.
ipecac either of two tropical South American plants related to madder, coffee, and gardenia, whose roots are used medicinally. [2 definitions]
iPhone trademark for a type of mobile telephone that includes an internet browser, camera, and music player.
iPod trademark for a pocket-sized digital audio player with a large storage capacity, primarily used to collect and play back downloaded digital music files.