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A warning on a navigational chart indicating a possible rock, shoal, or other hazard, the exact position of which is unknown.
[Spanish vigía, from Portuguese vigia, from vigiar, to look out, from Latin vigilāre; see vigilante.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Nautical Terms) nautical a navigational hazard marked on a chart although its existence and nature has not been confirmed
[C19: from Spanish vigía reef, from Latin vigilāre to keep watch]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014