primary root

noun

, Botany.

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

primary root

1. 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 .

Word History and Origins

Origin of primary root¹

First recorded in 1885–90

Example Sentences

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

From Project Gutenberg

These are exactly like the primary root from which they spring; there is no difference in structure or in machinery of growth.

From Project Gutenberg

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

From Project Gutenberg

These are all simple, that is, there is but one primary root.

From Project Gutenberg