Definition of nightside in English:

nightside

Syllabification: night·side
Pronunciation: /ˈnītsīd
 
/

noun

1 Astronomy The side of a planet or moon that is facing away from the sun and is therefore in darkness.
More example sentences
  • Much of the time, those energetic particles trickle in through the rear flanks of Earth's magnetic tail - on the nightside - and near the polar regions.
  • The disk is Earth with its nightside facing the Moon.
  • The first satellite, Geotail, was launched in 1992 by Japan's Institute of Space and Astronautical Science to study the distant reaches of Earth's magnetic tail, the region downwind on the nightside of Earth.
2chiefly US The world at night; activities that take place during the night: nightside was the province of the professional criminals

Definition of nightside in:

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Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude