noun
day of the week
Refers to the seven named days of the week (Monday–Sunday). Often used in compounds like 月曜日 (Monday).
今日は何曜日ですか。
What day of the week is it today?
来週の同じ曜日にもう一度来てください。
Please come again on the same day of the week next week.
Compound of 曜 (yō, 'day of the week') and 日 (hi, 'day'). The reading ようび is a regular on'yomi compound.