Where does this definition of principal tone come from?
This entry for principal tone is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is principal tone a noun, verb, or something else?
In this entry, principal tone is tagged as 2n..
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.