Thursday
noun
This is a day of the week. You know this because it has 曜日 in it. But what day of the week is it? The tree day of the week is Thursday. Tree day comes after water day (which is Wednesday, for Water-Wednesday!). Trees need water to grow, which is why the tree comes right after the water.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 曜日 as well.
木曜日は六時からピアノなんです。
I have piano lessons on Thursdays at six o'clock.
そうじは木曜日にしようと思ってます。
I am planning to do the cleanup on Thursday.
木曜日からセキが出てるんです。
I've been having coughs since Thursday.