Definition of nannandrium in US English:
nannandrium
noun
Botany
The single-celled male plantlet (dwarf male) of nannandrous green algae.
Origin
Early 20th century. From scientific Latin nannandrium from ancient Greek νάννος, variant of νᾶνος dwarf + scientific Latin -andrium.
Pronunciation
nannandrium
/naˈnandrɪəm/