[mahy-kroh-min-ee-uh-cher, -choo r, -min-uh-]
  1. built on an extremely small scale, smaller than subminiature, especially of electronic equipment with small solid-state components in the place of vacuum tubes.

Origin of microminiature

First recorded in 1955–60; micro- + miniature
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for microminiature

Historical Examples of microminiature