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primary root

noun, Botany.
the first root produced by a germinating seed, developing from the radicle of the embryo.
Origin of primary root
First recorded in 1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for primary root
Historical Examples
  • These are all simple, that is, there is but one primary root.

  • Forcible conquest and adverse occupation is nearly always the primary root of title.

    Is Ulster Right? Anonymous
  • These are exactly like the primary root from which they spring; there is no difference in structure or in machinery of growth.

    Rustic Sounds Francis Darwin
  • The single root of the commoner biennials is the primary root, or tap-root, which begins to thicken in the seedling.

primary root in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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