iambusEnglishOxford New American Dictionaryiambus /īˈambəs, aɪˈæmbəs / ▸ noun (plural iambuses or iambi /-bī/) Prosody another term for iamb. – ORIGIN late 16th century: Latin, from Greek iambos ‘iambus, lampoon’, from iaptein ‘attack verbally’ (because the iambic trimeter was first used by Greek satirists).