mirrorless

This term is a technical descriptor used almost exclusively within the context of digital photography. It describes a specific architectural shift in camera design where the internal mirror and pentaprism of a DSLR are removed, resulting in a more direct light path to the sensor.

Because it is a specialized technical adjective, it lacks a broader metaphorical or casual application. It is typically used in professional gear reviews, product specifications, and photography tutorials to contrast with "DSLR" (Digital Single-Lens Reflex) systems.