taproot

plural taproots

1. biologyA long, tapering root, exhibited by many plant species (such as carrots and dandelions).First known use early 17th c.

   The taproots of trees like the false acacia, growing between Park Royal and Alperton, thrust deeply into the ground, while the spreading roots of the silver birch stitch the soil.

   1950 July, “Traveller's Joy”, in Railway Magazine, page ii (advertisement)

   2 more examples

   Above the lower headcut, phreatophytic mesquite and little leaf sumac hug the banks, drawing pendulate water from the silts remaining from former marsh deposits and sending long taproots into channel stores.

   2007, Susan L. Woodward, “Modern Vegetation of the Murray Springs Area and the Upper San Pedro Valley”, in Caleb Vance Haynes, Bruce B. Huckell, editor, Murray Springs, page 58

   On the other hand, those who are compelled by a single strong desire are obsessed with a well-defined problem, which touches the taproot of their soul. They are on the attack, on the move.

   2024 October 10, David Brooks, “How Harris Can Finish Strong”, in The New York Times