Origin: Anc Greek επί/epi(=prefix meaning upon, on) +δέρμα/derma(=skin) > δέρω/dero(=peel)
1. (anatomy) the outer layer of the skin
2. (botany) the outermost layer of cells covering the leaves and young parts of a plant (root, stem) usually consisting of a single layer offering protection of the underlying tissues from excessive water loss.
3. (zoology) the outermost layer of the skin of a eumetazoan animal