[ ʌɪ'ambəs ]
■ noun ( plural ~es or iambi -bʌɪ ) Prosody a metrical foot consisting of one short (or unstressed) syllable followed by one long (or stressed) syllable.
Origin
C16: L., from Gk iambos '~, lampoon', from iaptein 'attack verbally' (because the iambic trimeter was first used by Greek satirists).