mo·tor·boat

[moh-ter-boht]
noun
1.
a boat propelled by an inboard or outboard motor.
verb (used without object)
2.
to travel in or operate a motorboat: to motorboat from Hyannis to Martha's Vineyard.

Origin:
1900–05; motor + boat

mo·tor·boat·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
motorboat (ˈməʊtəˌbəʊt) [Click for IPA pronunciation guide]
 
n
any boat powered by a motor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Motorboat is one of our favorite verbs.
So is subtilize. Does it mean:
to introduce subtleties into or argue subtly about.
to bark; yelp.
Encyclopedia Britannica
Encyclopedia

motorboat

a relatively small watercraft propelled by an internal-combustion or electric engine. Motorboats range in size from miniature craft designed to carry one person to seagoing vessels of 100 feet (30 m) or more. Most motorboats, however, have space for six passengers or fewer. Motorboats are used recreationally for traveling on water (cruising) and for the enjoyment of such sports as fishing, duck hunting, swimming, skin diving, and water skiing. In sport they are used for racing and in piloting and navigation contests.

Learn more about motorboat with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Every motorboat propelled by a motor on the waters of this state must be
  numbered and licensed as prescribed in this chapter.
She ran down to the beach, where a motorboat awaited.
The motorboat or vessel must be operated, in motion, en route but not aground
  or at anchor.
The motorboat pulled away from the beach not long after dawn.
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