ultraminiature

adjective

ul·​tra·​min·​i·​a·​ture ˌəl-trə-ˈmi-nē-ə-ˌchu̇r 

-ˈmi-ni-ˌchu̇r,

-ˈmin-yə-,

-chər 

-ˌtyu̇r,

-ˌtu̇r

: subminiature

Word History

First Known Use

1942, in the meaning defined above