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The Collaborative International Dictionary
Boation

Boation \Bo*a"tion\, n. [L. boatus, fr. boare to roar.] A crying out; a roaring; a bellowing; reverberation. [Obs.]

The guns were heard . . . about a hundred Italian miles, in long boations.
--Derham.

Wiktionary
boation

n. 1 (context obsolete uncountable English) bellow. 2 (context obsolete countable English) A roar.