齋日

斋日
zhāirì
  1. (Buddhism) uposatha (a day of fasting, devotion, or other religious observance)
  2. uposatha (a day of fasting, devotion, or other religious observance)

Wiktionary

Entry Composition

1 齋 zhāi
  1. to fast or abstain from meat, wine etc
  2. vegetarian diet
  3. study room
  4. building
  5. to give alms (to a monk)
=2 日 Rì abbr. for 日本 Rìběn, Japan
=2 日 rì
  1. sun
  2. day
  3. date, day of the month