D defs.my
Entry 1 sense Webster, 1913

Boation

/bō.āʹshən/ · Bo·a·tion · IPA /bəʊˈeɪʃən/
01 n. A crying out; a roaring; a bellowing; reverberation.
  1. 1.
    A crying out; a roaring; a bellowing; reverberation.[Obs.]
    “The guns were heard . . . about a hundred Italian miles, in long boations.” — Derham.