1. Relating to, consisting of, or containing salt water: a saltwater solution.
2. Inhabiting or occurring in seawater or salt water: saltwater fish; the saltwater crocodile.
3. Done or used in salt water: saltwater fishing; saltwater lures.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.