hornwort

noun horn·wort \ ˈhȯrn-ˌwərt , -ˌwȯrt \
|Updated on: 23 May 2018

Definition of hornwort

: any of a genus (Ceratophyllum of the family Ceratophyllaceae) of rootless thin-stemmed aquatic monoecious herbs with female flowers having a single carpel

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First Known Use of hornwort

circa 1805

in the meaning defined above

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