iambus(n = noun.communication) iamb - a metrical unit with unstressed-stressed syllables;
is a kind of foot, metrical foot, metrical unit
A foot consisting of a short syllable followed by a long one, as in
iambus, n. (pl. iambuses or -bi) Prosody a foot consisting of one short (or unstressed) followed by one long (or stressed) syllable.
Etymology:
L f. Gk iambos iambus, lampoon, f. iapto assail in words, from its use by Gk satirists