ionic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, containing, or involving ions.

from The Century Dictionary.

• In physical chemistry, of or pertaining to an ion or the ions which carry an electric current in electrolysis: see Arrhenius's theory of electrolytic or ionic dissociation.
• Of, pertaining, or relating to the Iones or Ionians as a race, or to one of the regions named from them, Ionia or the Ionian Islands: as, the Ionic dialect or school; the Ionic order.
• In ancient prosody, constituting a foot of two long syllables followed by two shorts, or vice versa; pertaining to or consisting of such feet: as, an Ionic foot, colon, verse, or system; Ionic rhythm.
• noun In prosody: An Ionic foot.
• noun An Ionic verse or meter.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Of or pertaining to ions; composed of ions, containing ions, or breaking down into ions when dissolved in a polar solvent. Opposite of nonionic.
• noun A foot consisting of four syllables: either two long and two short, -- that is, a spondee and a pyrrhic, in which case it is called the greater Ionic; or two short and two long, -- that is, a pyrrhic and a spondee, in which case it is called the smaller Ionic.
• noun A verse or meter composed or consisting of Ionic feet.
• noun The Ionic dialect.
• noun (Print.) Ionic type.
• adjective Of or pertaining to Ionia or the Ionians.
• adjective (Arch.) Pertaining to the Ionic order of architecture, one of the three orders invented by the Greeks, and one of the five recognized by the Italian writers of the sixteenth century. Its distinguishing feature is a capital with spiral volutes. See Illust. of Capital.
• adjective (Gr. Gram.) a dialect of the Greek language, used in Ionia. The Homeric poems are written in what is designated old Ionic, as distinguished from new Ionic, or Attic, the dialect of all cultivated Greeks in the period of Athenian prosperity and glory.
• adjective (Pros.) See Ionic, n., 1.
• adjective (Mus.) an ancient mode, supposed to correspond with the modern major scale of C.
• adjective a sect of philosophers founded by Thales of Miletus, in Ionia. Their distinguishing tenet was, that water is the original principle of all things.
• adjective a kind of heavy-faced type (as that of the following line).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry of, relating to, or containing ions

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective of or relating to Ionia or its inhabitants or its language
• noun the dialect of Ancient Greek spoken and written in Attica and Athens and Ionia
• adjective of or pertaining to the Ionic order of classical Greek architecture
• adjective containing or involving or occurring in the form of ions