seaware
sea·ware
(sē′wâr′)n.
Sea wrack used as fertilizer.
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.
seaware
(ˈsiːˌwɛə)n
(Plants) any of numerous large coarse seaweeds, esp when cast ashore and used as fertilizer
[Old English sǣwār, from sǣ sea + wār seaweed]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014