Definition from Wiktionary, the free dictionary
|Kanji in this term|
/suieu/ > /suiyoː/.
- IPA: /suijoː/
- (Esoteric cosmology) a day associated with the planet Mercury
- the fourth day of the week; the day between Tuesday and Thursday; Wednesday
- abbreviation for suiyōbi (“Wednesday”); Wed.
- 水曜日 (suiyōbi)
See also 
- 七曜 (shichiyō)