dac·tyl
noun/ˈdæktɪl/
/ˈdæktɪl/
(specialist)- a unit of sound in poetry consisting of one strong or long syllable followed by two weak or short syllables
（诗歌的）扬抑抑格，长短短格 Word Originlate Middle English: via Latin from Greek daktulos, literally ‘finger’ (the three bones of the finger corresponding to the three syllables).