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