subminiature

adj

1. (not-comparable)Compact or smaller than miniature.

   “Vacuum tubes and other circuit components have been produced in miniature and subminiature versions.”

2. (not-comparable)of photography equipment and techniques using a smaller frame than 35mm

   “Other Minolta cameras from $27 to $270, including subminiature, "snapshot," 35mm rangefinder and single lens reflex models...”

noun

1. Any item smaller than that considered miniature, especially electronic and electromechanical devices

   “One of these Raytheon Subminiatures takes the place of two old style tubes and its small size results in lower microphonics.”

2. A subminiature camera, generally with a frame smaller than 35mm

   “The popularity of today’s wide-angle lenses and the subminiatures with their inherently great depth of field testify to the success of this technique.”