noun, plural epitrichiums. Embryology.
the outermost layer of the epidermis in most mammalian fetuses, usually disappearing before birth.
Also called periderm.

1880–85; < Neo-Latin epi- + -trichium < Greek tríchion, diminutive of thríx hair (see trichion); so called because hair develops under it in human embryos

epitrichial, adjective
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epitrichium ep·i·trich·i·um (ěp'ĭ-trĭk'ē-əm)
See periderm.

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