definitions

primary root

noun Botany.

the first root produced by a germinating seed, developing from the radicle of the embryo.

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Nearby words

primary pulmonary lobule, primary qualities, primary quality, primary rainbow, primary reaction, primary root, primary school, primary sex characteristic, primary spermatocyte, primary stress, primary structure

Origin of primary root

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for primary root

primary root

The first root of a plant, originating in the embryo. In gymnosperms, eudicotyledons, and magnoliids, the primary root develops into the taproot. In monocotyledons, the primary root disintegrates as the lateral roots develop into a system of fibrous roots.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.