Relating to or containing endosperm, the nutritious tissue inside seeds that feeds the developing plant embryo.
From endo- (within) + spermic (related to seed), derived from Greek sperma (seed). The term emerged in 19th-century botany to describe the internal seed structures visible under microscopes.
Endospermic seeds are like packed lunches for baby plants—rice, corn, and wheat are all endospermic, which is why they're so nutritious for humans too. We're basically eating plant baby food when we eat these grains!
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