SINCE 1828
Pediastrum
noun
Ped·i·as·trum
| \
ˌpedēˈastrəm ,
ˌpēd- \
Definition of Pediastrum
: a genus of free-floating green algae (family Hydrodictyaceae) that have flat platelike colonies of two or more polygonal cells with the marginal cells usually differing in shape and having usually two projections of the cell wall
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