— epitrichial , adj.
/ep'i trik"ee euhm/ , n. , pl. epitrichiums . Embryol.
the outermost layer of the epidermis in most mammalian fetuses, usually disappearing before birth. Also called periderm .
[ 1880-85; -trichium tríchion, dim. of thríx hair (see TRICHION); so called because hair develops under it in human embryos ]