A metrical foot in poetry consisting of two syllables, typically one long and one short (or stressed and unstressed).
From Greek 'di-' (two) and 'daktylos' (finger), literally meaning 'two-fingered.' In metrics, it refers to a two-part rhythmic unit.
Fingers have bones in segments (two joints on many fingers), which is exactly how a didactyl works—it's two beats grouped together, the fundamental building block of poetic rhythm.
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