'Root' in the Bible

Now if the first-fruit be holy, the lump also; and if the root be holy, the branches also.

Now if some of the branches have been broken out, and thou, being a wild olive tree, hast been grafted in amongst them, and hast become a fellow-partaker of the root and of the fatness of the olive tree,

boast not against the branches; but if thou boast, it is not thou bearest the root, but the root thee.

And again, Esaias says, There shall be the root of Jesse, and one that arises, to rule over the nations: in him shall the nations hope.