from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of several small green nonvascular plants of the division Anthocerotophyta, having a flat thallus from which elongated, hornlike spore-producing structures grow.
  • noun Any of several aquatic vascular plants of the genus Ceratophyllum, forming branched masses in quiet water and having minute unisexual flowers and stiff, forked, whorled leaves resembling antlers or horns.

from The Century Dictionary.

  • noun An aquatic plant of the genus Ceratophyllum, the single species of which, C. demersum, is common in ponds and slow streams in most parts of the world. See cut under Ceratophyllaceæ.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) An aquatic plant (Ceratophyllum), with finely divided leaves.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A bryophyte with a leafless thallus characterized by a dominant gametophyte stage of the life cycle and a sporophyte stage shaped like a horn.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun liverworts with slender hornlike capsules
  • noun any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams


from Wiktionary, Creative Commons Attribution/Share-Alike License

From horn + Old English wort "plant", from the fact that the spores are produced in slender horn-shaped structures.


  • Even so, I bought the hornwort and three white clouds and went home.

    Day in the Life of an Idiot

  • Other good kinds are hornwort, water starwort, tape grass, water poppy, milfoil, willow moss, and floating plants like duckweed.

    Outdoor Sports and Games

  • In quiet fresh-water streams, and especially in ponds, there are _Myriophyllums_ (or water-milfoil), _Ceratophyllums_ (or hornwort), the aquatic

    St. Nicholas Magazine for Boys and Girls, Vol. 5, July 1878, No. 9

  • Grass, milfoil, water crowfoot, hornwort, starwort, horsetail, and a dozen other delicate plants, form one tangled forest, denser than those of the Amazon, and more densely peopled likewise.

    Prose Idylls, New and Old

  • In B we find remains of some of the same plants which were enumerated as common in the ancient lignite in 3 prime, such as the yellow water-lily and hornwort, together with some freshwater shells which occur in the same fluvio-marine series 3 prime.

    The Antiquity of Man

  • Weed fragments were found by NIWA staff in March last year and said they were likely to have arrived on a vessel used in nearby hornwort-infested lakes.

    NZ On Screen

  • In a hornwort the sporophytes are erect and needle-like.

    CreationWiki - Recent changes [en]

  • In a hornwort the sporophytes are erect and needle-like.

    CreationWiki - Recent changes [en]

  • Anthocerotales by the U.S. Department of Agriculture Survey of hornwort populations in selected arable fields in the Swiss Plateau Irene Bisang, Luc Lienhard und Ariel Bergamini, unknown publisher, July 2008.

    CreationWiki - Recent changes [en]

  • In some anthoceros, the hornwort presents pores in the capsule walls or lacks them.

    CreationWiki - Recent changes [en]


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