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ultraminiature

[uhl-truh-min-ee-uh-cher, -choo r, -min-uh-cher]
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adjective
  1. subminiature.

Origin of ultraminiature

First recorded in 1940–45; ultra- + miniature
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018