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