We found 8 dictionaries that define the word day-and-night:

General (7 matching dictionaries)

1. day-and-night: Vocabulary.com
2. day-and-night: Wordnik
3. day-and-night: Dictionary.com
4. day-and-night: Rhymezone
5. day-and-night: FreeDictionary.org
6. day-and-night: Mnemonic Dictionary
7. day-and-night: TheFreeDictionary.com

Computing (1 matching dictionary)

8. day-and-night: Encyclopedia

Definitions from WordNet (day-and-night) ▸ adjective:  at all times Opposite: continuous, perpetual, unceasing, unending, eternal ▸ Words similar to day-and-night ▸ Usage examples for day-and-night ▸ Idioms related to day-and-night ▸ Wikipedia articles (New!) ▸ Popular nouns described by day-and-night ▸ Words that often appear near day-and-night ▸ Rhymes of day-and-night ▸ Invented words related to day-and-night