(In some seeds) a mass of nutritive material outside the embryo sac.
- In cucumber, muskmelon, and other seeds, a thin perisperm-endosperm envelope completely encloses the embryo.
- Scarification was accomplished by piercing the seed coat and scraping a small portion of the perisperm with a sterile dissecting needle.
- The perisperm is present in abundance.
Early 19th century: from peri- 'around' + Greek sperma 'seed'.
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