If something is specular, it has a smooth, shiny surface that reflects light.
The word specular makes people think of shiny things like mirrors or polished metal.
Examples:
The lake was specular in the sunlight.
She looked at her specular reflection in the mirror.
The specular metal shone brightly.
The specular floor made the room look bigger.
The specular diamond sparkled in the light.
The specular surface was like a magic mirror.