primary root

American  

noun

Botany.

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

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primary root Scientific  

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.

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Etymology

Origin of primary root

First recorded in 1885–90

Example Sentences

Grain of Indian Corn in germination, the ascending sprout is the first leaf of the plumule, enclosing the younger leaves within, at its base the primary root has broken through.

From The Elements of Botany For Beginners and For Schools by Gray, Asa

In many Dicotyledons and most Monocotyledons, the primary root soon perishes, and its place is taken by adventitious roots developed from the stem.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various

That the primary root of all educational activity is in the instinctive, impulsive attitudes and activities of the child, and not in the presentation and application of external material.

From The History of Education; educational practice and progress considered as a phase of the development and spread of western civilization by Cubberley, Ellwood Patterson

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

From Outlines of Lessons in Botany, Part I; from Seed to Leaf by Newell, Jane H.

The primary root of the embryo in all Angiosperms points towards the micropyle.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various