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