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The Collaborative International Dictionary
bloviator

bloviate \blo"vi*ate\ (bl[=o]"v[i^]*[=a]t), v. i. [imp. & p. p. bloviated (bl[=o]"v[i^]*[=a]*t[e^]d); p. pr. & vb. n. bloviating (bl[=o]"v[i^]*[=a]*t[i^]ng).] To orate pompously; -- used especially of politicians and news commentators.
--Frank Rich (N. Y. Times Jan. 6, 1999, p. A23) -- blo"vi*a*tor, n. -- blo"vi*a*tion, n.

``We've had almost three weeks of lawyers bloviating about what the facts in the case are,'' Mr. Rogan said. ``Wouldn't it be easier to bring the witnesses?''
--Quoted by Eric Schmitt in (The New York Times), Jan 22, 1999, p. A15.

Wiktionary
bloviator

n. One who habitually bloviates; a pompous, opinionated, typically voluble commentator.