Where does this definition of regular-mail come from?
This entry for regular-mail is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is regular-mail a noun, verb, or something else?
In this entry, regular-mail 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.