American Heritage Dictionary
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
The barge was actually two 295-foot flat-bottom vessels attached together.— TravelDailyNews.com
The Grand Forks County Sheriff's Department said deputies used a flat-bottom boat and an inflatable boat to transport four linesmen and their equipment early Saturday to an area south of Grand Forks, near the Thompson bridge.— Homepage | The Forum | Fargo, ND
The couple were in a mid-sized, two-toned pickup, either blue and silver or blue and gray, with a flat-bottom boat or john boat in the back, Riordan said.— news | GS | http://www.gainesville.com
Caltrans plans to replace the Real McCoy, a flat-bottom, double-ended ferry powered by two engines and propellers that can be turned 360 degrees, but with the state budget crisis threatening funding for transportation projects, it's not certain when.— SFGate: Top News Stories
Using flat-bottom wooden spoon or heatproof spatula, stir mixture constantly over medium heat, scraping bottom and sides of pan until pudding thickens and begins to bubble at edges, about 5 minutes.— Blisstree

If you'd like to prod us on getting a pronunciation for this word, sign in (or sign up) and let us know.
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
We are still working on calculating this word's frequency.