noun
Computing term for a glossary, typically a list of difficult or technical terms with explanations.
このソフトウェアの難語集には専門用語の定義が載っている。
The glossary of this software contains definitions of technical terms.
Compound of 難語 (nango, 'difficult word') and 集 (shū, 'collection'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.