A metrical foot in poetry consisting of one stressed syllable followed by two unstressed syllables, like 'merrily' or a finger/toe (the anatomical meaning).
From Greek daktylos meaning 'finger' or 'toe.' In poetry, the three-beat pattern resembles a finger's three bones. The term was borrowed into English for both poetry and anatomy.
Your fingers have three bones, and a dactyl has three beats—ancient Greek poets literally named the rhythm after your hand! When you say 'MER-ri-ly,' you're using the same pattern as your finger structure!
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