Spirodela
noun
Spi·ro·de·la
ˌspīrəˈdēlə
: a genus of aquatic plants (family Lemnaceae) having a membranous spathe and a thallus with a cluster of several rootlets see great duckweed
Word History
Etymology
New Latin, from spir- + -dela (from Greek dēlos visible, evident); from the fact that the spiral vessels are visible through the transparent tissues