When some cycles occur

• Monday, to housewives
• Occasion for throwing in and folding
• Time to do the laundry
• A day set aside for doing household laundry
• Toilsome part of the week
• Laundry time
• Monday, to many

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Why do they build such small sculleries which make washday a dread.

WordNet Word definitions in WordNet
n. a day set aside for doing household laundry [syn: washing day ]

Wiktionary Word definitions in Wiktionary
n. A day when laundry is washed.