Term:

Epicotyl
Definition:

That part of the main axis of an embryo or the young stem of a seedling located above the point of attachment of the cotyledons. The epicotyl gives rise to the leaves, the first of which are called eophylls.
Notes:

The macropodial embryos of species of the genera Bertholletia, Corythophora, Eschweilera, Grias, Lecythis are nondescript areas on a axis that are not differeniated (= macropodial embryos) so it is difficult to determine where a epicotyl begins or ends.