otter board

noun Nautical.
one of a pair of large, heavy, square or rectangular plates or boards of metal or weighted wood attached to the trawl lines on each side of the mouth of a trawl net to maintain lateral spread during trawling.

1765–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The trawl net is held open by a large otter board or door on each side of the net mouth.
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