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The Collaborative International Dictionary
Blatteroon

Blatteroon \Blat`ter*oon"\, n. [L. blatero, -onis.] A senseless babbler or boaster. [Obs.] ``I hate such blatteroons.''
--Howell. [1913 Webster] ||

Wiktionary
blatteroon

n. (context obsolete English) A senseless babbler or boaster.