Wiktionary
microminiature
n. A particularly small miniature.
Usage examples of "microminiature".
He had had some kind of microminiature infrared sensors built into his steel eyes.
Inside the case were seven others, little jeweled globes packed with microminiature circuitry, soaked tight with advanced software.
The microminiature circuitry within my staff was sufficient to the occasion, and while I would rather it had occurred later, perhaps it was good for me that it happened when it did.
One runs to a charge coupled device (CCD) camera and the other to a microminiature spectrophotometer.
The illumination by hundreds, thousands, of microminiature point sources was harsh, brilliant, and shadowless.