Dictionary of Biblical Words:
This was originally used as a type of the Jewish people, but on their failure (Isa. 5), the Lord applies the figure to Himself (John 15), those who attach themselves to Him on earth by profession being the branches, the proof of Divine life not being shown in their being branches, but in their bearing fruit.
Strong’s Dictionary of Hebrew Words:
Meaning:
from an unused root meaning to bend; a vine (as twining), especially the grape