1. A boat with two parallel hulls or floats, especially a light sailboat with a mast mounted on a transverse frame joining the hulls.
2. A raft of logs or floats lashed together and propelled by paddles or sails.
[Tamil kaṭṭumaram : kaṭṭu, to tie + maram, wood, log.]
(click for a larger image)catamaran
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.