morrow

The morrow is the following day, in old use. On the morrow, the morrow came, good morrow.

It is entirely archaic and survives in poetry, in Shakespeare and in the fixed phrase on the morrow. Good morrow was the ordinary morning greeting until about the seventeenth century. Note that tomorrow is to plus morrow, so the everyday word contains the archaic one; and that morrow and morning are the same root, because the following day begins with its morning.