last third of a month; 21st to the last day of a month
middle ten days of a month; 11th to 20th day of a month
first third of a month; first ten days of a month
first 10 days of the month
ten-day period (in a month); ten-year period (in one's age); decade
killer demon; demon who strives to destroy all goodness
Shavuot; Feast of Weeks; (Jewish) Pentecost; Pentecost; Whitsunday
month and ten days; ten months; short time