Hypertext Webster Gateway: "taproot"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Taproot \Tap"root`\, n. (Bot.)
The root of a plant which penetrates the earth directly
downward to a considerable depth without dividing.
From WordNet (r) 1.7 (wn)
taproot
n : main root of a plant growing straight downward from the stem
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