Where does this definition of key source come from?
This entry for key source is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does key source appear elsewhere on Lughet?
Yes — key source appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.