noun, adverb
The third day of the week. Can be used as a noun or adverbially (e.g., 水曜日に).
来週の水曜日は休みです。
Next Wednesday is a holiday.
水曜日に会議があります。
There is a meeting on Wednesday.
From 水 (すい, 'water') + 曜日 (ようび, 'day of the week'), following the traditional seven-day naming system based on celestial bodies.