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Meaning of otter board

ot'ter board"

Pronunciation: [key]
— Naut. Naut.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.