A knife that has a fixed blade and fits into a sheath.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sheath knife" in a sentence
"When the bleeding headless body staggered about the yard in the time-honored habit of sots, Ruby pointed to it with her ragged sheath knife and said, “That's your sustenance there.”"