The fourth day of the week, following Wednesday and preceding Friday. The kanji '木' (moku) means tree or wood, culturally linking it to the planet Jupiter. It's usually the penultimate day of the standard workweek.

週(しゅう)の四(よっ)日(か)目(め)で、水(すい)曜(よう)日(び)の次(つぎ)に来(く)ます。「木(もく)」の字(じ)は木(もく)星(せい)を表(あらわ)し、週(しゅう)末(まつ)に近(ちか)づきます。