Primary-root
noun, Botany.
1.
the first root produced by a germinating seed, developing from the radicle of the embryo.
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.
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