extremely thin: an ultrathin wristwatch.

1945–50; ultra- + thin

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Example sentences
Researchers have made ultrathin refrigerators for microprocessors.
Bacteria coat your skin in an ultrathin protective armor, which helps keep
  harmful microbes at bay.
The sensor consists of an ultrathin gold film to which chemical receptors are
It is delicious and comes with a salad and either fries or ultrathin house-made
  potato chips.
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