|Easton's Bible Dictionary|
Exile; wandering; unrest, a name given to the country to which Cain fled (Genesis 4:16). It lay on the east of Eden.
Noah Webster's Dictionary
1. (v. i.) To bend or incline the upper part, with a quick motion; as, nodding plumes.
2. (v. i.) To incline the head with a quick motion; to make a slight bow; to make a motion of assent, of salutation, or of drowsiness, with the head; as, to nod at one.
3. (v. i.) To be drowsy or dull; to be careless.
4. (v. t.) To incline or bend, as the head or top; to make a motion of assent, of salutation, or of drowsiness with; as, to nod the head.
5. (v. t.) To signify by a nod; as, to nod approbation.
6. (v. t.) To cause to bend.
7. (n.) A dropping or bending forward of the upper part or top of anything.
8. (n.) A quick or slight downward or forward motion of the head, in assent, in familiar salutation, in drowsiness, or in giving a signal, or a command.
Int. Standard Bible Encyclopedia
nod (nodh): The land of Eden, to which Cain migrated after the murder of his brother and his banishment by Yahweh (Genesis 4:16). Conjecture is useless as to the region intended. The ideas of China, India, etc., which some have entertained, are groundless. The territory was evidently at some distance, but where is now undiscoverable.
Nod (2 Occurrences)
Genesis 4:16 Cain went out from Yahweh's presence, and lived in the land of Nod, east of Eden. (WEB KJV JPS ASV BBE DBY WBS NAS RSV NIV)
Job 16:4 I also, like you, might speak, If your soul were in my soul's stead. I might join against you with words, And nod at you with my head. (YLT)