Where does this definition of permanent hardness come from?
This entry for permanent hardness is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does permanent hardness appear elsewhere on Lughet?
Yes — permanent hardness 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.
