any of a genus (Ceratophyllum) of long, rootless waterlilies of the hornwort family submerged in lakes and slow-moving streams and having whorls of finely divided leaves
Origin:
after ModL Ceratophyllum: see cerato- & -phyll
adjective
designating a family (Ceratophyllaceae) of dicotyledonous, rapidly growing waterlilies
See hornwort in American Heritage Dictionary 4
noun
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.