root (shoresh; rhiza):

Frequently mentioned in the Old Testament and New Testament, but almost always in a figurative sense, e.g. "root of the righteous" (Proverbs 12:3,12); "root that beareth gall" (Deuteronomy 29:18); "Their root shall be as rottenness" (Isaiah 5:24); "root of bitterness" (Hebrews 12:15). Also of peoples: "they whose root is in Amalek" (Judges 5:14); of Assyria (Ezekiel 31:7); "Ephraim is smitten, their root is dried up" (Hosea 9:16); "Judah shall again take root downward" (2 Kings 19:30; compare Isaiah 27:6; 37:31); the root of Jesse (Isaiah 11:10; Romans 15:12); root of David (Revelation 5:5; 22:16).

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'ROOT'". "International Standard Bible Encyclopedia". 1915.