iambusyoudaoicibaDictYouDict[iambus 词源字典]
"A metrical foot consisting of one short (or unstressed) syllable followed by one long (or stressed) syllable", Late 16th century: Latin, from Greek iambos 'iambus, lampoon', from iaptein 'attack verbally' (because the iambic trimeter was first used by Greek satirists).[iambus etymology, iambus origin, 英语词源]