the GNU version of the Collaborative International Dictionary of English
n. A foot consisting of a short syllable followed by a long one, as in ămāns, or of an unaccented syllable followed by an accented one, as invent; an iambic. See the Couplet under iambic, n.
The Century Dictionary and Cyclopedia
n. In prosody, a foot of two syllables, the first short or unaccented and the second long or accented.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a metrical unit with unstressed-stressed syllables
Word Usage
"That verse wherein the accent is on the even syllables may be called even or parisyllabic verse, and corresponds with what has been called iambic verse; retaining the term iambus for the name of the foot we shall thereby mean an unaccented and an accented syllable."