primary wall

American  

noun

Botany.

1. the wall of a plant cell that is formed first around the protoplast, composed of cellulose microfibrils aligned at all angles and held together by hydrogen bonds.

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Example Sentences

In places where no barriers previously existed, the administration built a total of 47 miles of new primary wall.

From New York Times

In places where no barriers previously existed, such as the rugged terrain where the Arizona Trail winds to its terminus, the Trump administration built a total of 47 miles of new primary wall.

From Seattle Times

Of this 47 miles is what's called primary wall, and 33 miles is secondary wall that reinforces the initial barrier.

From BBC

Additionally, about 30 more miles of wall were erected as a second tier, set back from the primary wall along the border, with a road running between them.

From Washington Times

Two miles of primary wall and five miles of secondary wall are being installed at sites where there was no previous wall built.

From Fox News