The outer layer or covering of a seed, particularly the seed coat or testa that protects the inner embryo.
From Greek epi- 'upon' + sperma 'seed.' Botanical terminology coined in the 19th century to describe the protective layers of seeds.
The episperm is like a seed's suitcase—it protects the baby plant and contains germination triggers that activate when conditions are right, making seeds nature's perfect survival pods!
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