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1. (plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision
   - spectacles, eyeglasses [N. Amer], glasses

1. A detailed description of design criteria for a piece of work
   - specification

1. Give (particular features etc.) as part of the specification

Sounds like:

Type of: description, optical instrument, verbal description

Part of: frame

Encyclopedia: Specs