American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Dealing with the truculence is the referees, and they are not finding it easy.— Blogposts | guardian.co.uk
He out-puritans the Puritans; he is more fanatic than his idol; he has chosen to express himself with such a righteous truculence, such a sanguinary zeal, such a pious contempt for human virtue and human sympathies, as would have startled Old Noll himself.— Blackwood's Edinburgh Magazine, Volume 61, No. 378, April, 1847

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.