- a device for shooting a barbed missile under water, usually by means of gas under pressure, a strong rubber band, or a powerful spring.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for spear gun
His spear-gun, the knife at his waist belt, neither were protection against this!
Ashe dug the butt of his spear-gun into the sand on the flooring to uncover another oval depression.
- a device for shooting spears underwater