chhit-sûn七旬

Buddhist or Taoist rituals performed every seven

Buddhist or Taoist rituals performed every seven days after a person's death until the 49th day

English Wiktionary, “七旬” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E4%B8%83%E6%97%AC · confidence: Medium (Wiktionary)