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