Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a parasitic lamprey (Petromyzon marinus) of the N Atlantic that ascends streams to spawn: now landlocked in the Great Lakes, where it is highly destructive to lake trout
Used by arrangement with John Wiley & Sons, Inc.
nounThe 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 large marine lamprey (Petromyzon marinus) common in the Great Lakes and parasitic to freshwater fish.