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 (hôrn′wûrt′, -wôrt′)
1. Any of several small green nonvascular plants of the division Anthocerotophyta, having a flat thallus from which elongated, hornlike spore-producing structures grow.
2. 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.


1. (Plants) any aquatic plant of the genus Ceratophyllum, forming submerged branching masses in ponds and slow-flowing streams: family Ceratophyllaceae
2. (Botany) any of a group of bryophytes belonging to the phylum Anthocerophyta, resembling liverworts but with hornlike sporophytes


(ˈhɔrnˌwɜrt, -ˌwɔrt)

any of several rootless aquatic herbs of the genus Ceratophyllum, having finely dissected, whorled leaves.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hornwort - any aquatic plant of the genus Ceratophyllumhornwort - any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams
Ceratophyllum, genus Ceratophyllum - constituting the family Ceratophyllaceae: hornworts
aquatic plant, hydrophyte, hydrophytic plant, water plant - a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
2.hornwort - liverworts with slender hornlike capsules
Anthocerotales, order Anthocerotales - hornworts; liverworts having a thalloid gametophyte; in some classification systems included in the class Hepaticopsida
hepatic, liverwort - any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses
References in periodicals archive ?
Adding underwater aquatic plants such as anacharis, hornwort and parrot's feather, will add oxygen to the water.
Hornwort and the water buttercup are a good choice here, but avoid Elodea - Canadian pondweed - as this is extremely invasive.
Submerged species include hornwort, water starwort, frog's lettuce, water violet and water lobelia.
Submerged vegetation (various pondweed, myriophyllum, bladderwort, hornwort, charophyceae) develops in most basins abundantly.
But after a cold front turned the shallow bass tentative on my recent trip--they'd pick up then drop big live shiners, often holding them crosswise by the belly, away from the hook--we shifted to deeper flats offshore where bass were scattered among clumps of hydrilla and hornwort in 7 to 8 feet of water.
Common waterweed and hornwort, both submergent plants, are a good choice for their high oxygen content.
Kurschner (2000) reports 224 bryophyte species (one hornwort, 50 liverworts and 173 mosses) from the Arabian Peninsula and Socotra.
First, when one sees a liverwort, hornwort, or moss in the field or elsewhere, the observed specimen, with only a very few exceptions, represents the gametophyte (1n) phase of the organism's heteromorphic alternation of phases (or generations).
Submerged oxygenators: Canadian Pondweed, Eelgrass, Fanwort, Hornwort, Water Moss, and Water Violet.
Be sure to include submergent plants such as common waterweed (Elodea) and hornwort (Ceratophyllum) for their high oxygen output.
Examples of oxygenating plants include water buttercup, curly pond weed, water milfoil, and hornwort.
Floating oxygenators, sometimes referred to as "nature's filter," are underwater plants that contribute to clear water and provide cover and protection for adult and baby fish; among them are duckweed, hornwort and parrots feather.