backface

The English word “backface” has 1 meaning listed here.

noun

The back side of a face of a mesh, which typically will never face the camera and can thus be culled (discarded) from the list of items to be rendered.

From back + face.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.