Any of several submerged plants of the genus Ceratophyllum, forming branched masses in quiet water and having finely dissected, whorled leaves and minute unisexual flowers.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hornwort" in a sentence
"Even so, I bought the hornwort and three white clouds and went home."
"Other good kinds are hornwort, water starwort, tape grass, water poppy, milfoil, willow moss, and floating plants like duckweed."
"In quiet fresh-water streams, and especially in ponds, there are _Myriophyllums_ (or water-milfoil), _Ceratophyllums_ (or hornwort), the aquatic"