Examples from the Web for taproot
Taproot: the main root of a plant, which runs directly down into the earth to a considerable depth without dividing.Agriculture for Beginners|Charles William Burkett
By the following autumn, the better seedlings will have ten or twelve inches of top, and two and a half or three feet of taproot.
The root of evil, the taproot from which the evils of modern society develop, is the profit idea.The Common Sense of Socialism|John Spargo
Furthermore, without doubt, one of these roots would have grown so as to replace the taproot.
Some of them had sent down a taproot nearly or quite three inches in length.Walnut Growing in Oregon|Various