spear gun

a device for shooting a barbed missile under water, usually by means of gas under pressure, a strong rubber band, or a powerful spring.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spear gun
a device for shooting spears underwater

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Shortly after locating the stringer a spear gun was found at the bottom of the
It does not include the mechanically propelled device commonly called a spear
Other fishing-related debris included leaders and spear gun parts, and non-gear
  debris included cans, bottles and rope.
Sport fishing with hook and line, spear gun, or hand-held implements is
  generally permitted within the reserve.
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