D defs.my
Entry 1 sense Webster, 1913

Anacrusis

· An·a·cru·sis · IPA /anəˈkɹuːsɪs/
01 n. A prefix of one or two unaccented syllables to a verse properly beginning with an accented syllable.
  1. 1.
    A prefix of one or two unaccented syllables to a verse properly beginning with an accented syllable.(Pros.)