1) Component 2) Component part 3) Fraction of a fraction 4) Part 5) Portion 6) Portion portion 
[n] - a part of a part
See under rootstock & rootstock vine. Rootstock & rootstock vine Designation for the lower part or rootstock of a grafted vine that comes from a phylloxera-resistant American vine. During grafting, the upper part (grafting rice) of European grape varieties of the species Vitis vinifera is grafted onto this. The main reason for such grafting is...
noun a part of a part