American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
The head is often bulbous -- anywhere from slightly to quite pronounced.— open source sex
His nose was red and bulbous, his eyes narrow-set beneath bushy red eyebrows.— Roosevelt in the Bad Lands
"Perhaps that is the likeness of a mandarin--bulbous nose, hanging cheeks, moustaches drooping like plumes, a peaked head, knotty hands--a regular deformity.— The Aldine, Vol. 5, No. 1., January, 1872 A Typographic Art Journal

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.
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