An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.

(slang) I don't.

(chemistry) The anion IO₃⁻; Any salt of iodic acid.

(transitive) To treat with iodine.

(inorganic chemistry) A binary compound of iodine and another element or radical.

I owe you.

An informal promissory note that is not a negotiable instrument.

(biochemistry) A protein complex or single protein which penetrates a cell membrane and catalyzes the passage of specific ions through that membrane.

Initialism of Institute of Biology.

A state in the Midwestern region of the United States. Capital and largest city: Des Moines. / A tributary of the Mississippi River which flows through Iowa in a southeast direction.