American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
The absence of a tail-- for that member is represented only by a very small protuberance or "knob"--imparts a character of lightness to his body.— The Hunters' Feast Conversations Around the Camp Fire
It is of great importance that the edges of the leather should be smoothly pared down with a sharp knife, so as to present an even edge where the leather joins the boards, not a protuberance--which makes an ugly and clumsy piece of work, instead of a neat one For half-binding, a piece of leather is taken large enough to cover the back lengthwise, and turn in at the head and tail, while the width should be such as to allow from one to one and a half inches of the leather to be firmly glued to the boards next the back.— A Book for All Readers An Aid to the Collection, Use, and Preservation of Books and the Formation of Public and Private Libraries
On the back of the immense fish was a curious flat protuberance, above which rose another in the form of a dome-shaped hump, with, if we may venture to repeat so incredible a story, eyes all round it, and surmounted by an object having a very marked resemblance to a silver crown.— The Log of the Flying Fish A Story of Aerial and Submarine Peril and Adventure

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 once a year.
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