D layer

noun

1. the lowest region of the ionosphere, characterized by mounting electron and ion density: exists, during the day only, from about 43 to 50 miles (70 to 80 km) altitude.

D layer

1. See D region

Word History and Origins

Origin of D layer¹

First recorded in 1930–35

Example Sentences

Later in the weekend, she’d layer the foundry recording over sounds made using bronze objects from the workshop in a performance with gong-master Tatsuya Nakatani at the Firehouse, a Joshua Tree venue.

From Los Angeles Times

He just seems to me the type who’d layer on the Right Guard for days before he’d finally break down and take a shower.

From Literature

During the summer, the type relied on in-season fruit, like peaches or blackberries, which we’d layer with vanilla pastry cream.

From Slate

Koelemeijer, P. J., Deuss, A. & Trampert, J. Normal mode sensitivity to Earth’s D″ layer and topography on the core-mantle boundary: what we can and cannot see.

From Nature

“Come evening I’d layer with a cute crop jean jacket for when it gets cold, and top everything off with lots of jewels, of course!”

From Forbes