Where does this definition of age hardening come from?
This entry for age hardening is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Does age hardening appear elsewhere on Lughet?
Yes — age hardening 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.