noun. any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams.
- aquatic plant
- water plant
- genus Ceratophyllum
noun. liverworts with slender hornlike capsules.
- order Anthocerotales
Example sentences of the word hornwort
1. Noun, singular or mass
While hornwort is a tropical pond plant, it is able to survive winter climates.
The thalli of most hornwort species tend to be several cells thick, except for those in genus Dendroceros.