Meaning of Loch Ness monster

Loch' Ness" mon'ster

Pronunciation: [key]
  1. a large aquatic animal resembling a serpent or a plesiosaurlike reptile, reported to have been seen in the waters of Loch Ness, Scotland, but not proved to exist.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.