The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A strait between Puerto Rico and the Dominican Republic connecting the northern Atlantic Ocean with the Caribbean Sea. Mona Island, in the passage, was discovered by Columbus in 1493 and is today part of Puerto Rico.