hornwort
1. any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams • Hypernyms: aquatic plant, water plant, hydrophyte, hydrophytic plant • Member Holonyms: Ceratophyllum, genus Ceratophyllum 2. liverworts with slender hornlike capsules • Hypernyms: liverwort, hepatic • Member Holonyms: Anthocerotales, order Anthocerotales
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