from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A device equipped with sharp teeth and towed alongside a ship to cut the mooring cables of submerged mines.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device, stabilized with vanes, towed alongside a vessel such that the cable attaching it cuts the moorings of submerged mines.
- n. A towed underwater object with hydrofoils, of diverse uses
From its having vanes to keep it at a constant depth.(American Heritage® Dictionary of the English Language, Fourth Edition)
From para- + vane (Wiktionary)