noun which may take the genitive case particle 'no', noun
ultrathin; extra-thin
Describes something extremely thin, often used for materials, films, or coatings. Commonly appears in technical or product contexts.
このスマホは極薄のガラスを使っている。
This smartphone uses ultrathin glass.
極薄のフィルムを貼るのは難しい。
Applying an ultrathin film is difficult.
Compound of 極 (ごく, 'extremely') and 薄 (うす, 'thin'). The reading ごくうす follows standard rendaku rules.