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Any of certain rockweeds, especially the widely distributed Fucus vesiculosus, having forked, brownish-green branches with gas-filled bladders.
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.
a common seaweed, Fucus vesiculosus, of cold marine waters, having narrow brownish fronds with air-filled vesicles.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.