adjective. Having two faces, fronts, or façades.

adjective. Having two opposing surfaces that are alike.

adjective. Flaked in such a way as to produce a cutting edge that is sharp on both sides. Used of a stone tool.

Having the opposite surfaces alike.

In botany, having the opposite faces unlike: as, the bifacial arrangement of the parenchyma or green pulp upon the two faces of a leaf. Also dorsiventral.

Having two fronts or principal faces; specifically, having two human faces turned in opposite directions, as a medal or an image.

In geometry, having two distinguishable sides or faces.

adjective. Having the opposite surfaces alike.

adjective. Having two faces or opposing surfaces

adjective. Having two sharp cutting edges

adjective. having two faces or fronts

"The company says the cells are less than 50 microns, or less than two-thousandths of an inch, making them the thinnest in production, and bifacial, meaning they can capture sun energy from both faces."

bifacial surface  

bidirectional