Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Any of various submerged aquatic algae of the family Characeae that are frequently encrusted with calcium carbonate deposits and have nodes with whorled, filamentlike branchlets.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.