hornwort
nounUK /ˈhɔːnwɜːt/
US /ˈhɔːrnwɜːrt/
A hornwort is a small green plant that grows in water or wet places and has no real roots or leaves.
The pond was full of hornwort floating just under the surface.
OTHER MEANINGS
2. Any of a group of nonvascular plants with horn-shaped spore capsules.
Scientists studied the hornwort under a microscope to see its spores.
3. A submerged aquatic plant often used in aquariums and ponds.
He added hornwort to his fish tank to give the fish places to hide.
4. A common name for several unrelated plants with horn-like parts.
In some regions, hornwort refers to a weed that grows in ditches.