Strong's #3571: nux (pronounced noox)
 a primary word; "night" (literally or figuratively):-- (mid-)night.
Thayer's Greek Lexicon:
 ́ 
 
  nux 
 
 1) night
 2) metaphorically the time when work ceases
 
 2a) the time of death
 2b) the time for deeds of sin and shame
 2c) the time of moral stupidity and darkness
 2d) the time when the weary and also the drunken give themselves up to slumber
 
  Part of Speech: noun feminine
Relation: a primary word
  Citing in TDNT: 4:1123, 661
 
Usage:
This word is used 65 times:
Matthew 2:14: "and his mother  by night, and departed into Egypt:"
Matthew 4:2: "days and forty  nights, he was afterward hungry."
Matthew 12:40: "days and three  nights in the whale's belly;"
Matthew 12:40: "days and three  nights in the heart of the"
Matthew 14:25: "in the fourth watch of the  night Jesus went unto them,"
Matthew 25:6: "And  at midnight there was a cry made, Behold, the bridegroom"
Matthew 26:31: "because of me this  night: for it is written, I will smite"
Matthew 26:34: "unto thee, That this  night, before the cock crow,"
Matthew 27:64: "his disciples come  by night, and steal him away, and say"
Matthew 28:13: "ye, His disciples came  by night, and stole him away while we slept."
Mark 4:27: "should sleep, and rise  night and day, and the"
Mark 5:5: "And always,  night and day, he was in the"
Mark 6:48: "the fourth watch of the  night he cometh unto them, walking"
Mark 14:27: "because of me this  night: for it is written, I will smite"
Mark 14:30: "this day, even in this  night, before the cock crow"
Luke 2:8: "over their flock  by night."
Luke 2:37: "but served God with fastings and prayers  night and day."
Luke 5:5: "we have toiled all the  night, and have taken nothing: nevertheless"
Luke 12:20: "unto him, Thou fool, this  night thy soul shall be required of"
Luke 17:34: "I tell you, in that  night there shall be two men in one"
Luke 18:7: "elect, which cry day and  night unto him, though"
Luke 21:37: "the temple; and  at night he went out, and abode in the"
John 3:2: "came to Jesus  by night, and said unto him, Rabbi,"
John 7:50: "(he that came to Jesus  by night, being one of them,)"
John 9:4: "while it is day:  the night cometh, when no man can"
John 11:10: "walk in the  night, he stumbleth, because there is no"
John 13:30: "went immediately out: and it was  night."
John 19:39: "which at the first came to Jesus  by night, and brought a mixture of myrrh"
John 21:3: "immediately: and that  night they caught nothing."
Acts 5:19: "the angel of the Lord by  night opened the prison doors,"
Acts 9:24: "day and  night to kill him."
Acts 9:25: "disciples took him  by night, and let him down by the"
Acts 12:6: "have brought him forth, the same  night Peter was sleeping"
Acts 16:9: "to Paul in the  night; there stood a man of Macedonia,"
Acts 16:33: "same hour of the  night, and washed their stripes; and"
Acts 17:10: "and Silas by  night unto Berea: who coming"
Acts 18:9: "Lord to Paul in  the night by a vision, Be not afraid,"
Acts 20:31: "to warn every one  night and day with tears."
Acts 23:11: "And the  night following the Lord stood by him,"
Acts 23:23: "the third hour of the  night;"
Acts 23:31: "Paul, and brought him by  night to Antipatris."
Acts 26:7: "instantly serving God day and  night, hope to come. For"
Acts 27:23: "there stood by me this  night the angel of God, whose I am,"
Acts 27:27: "But when the fourteenth  night was come, as we were driven up and down in"
Acts 27:27: "in Adria, about  midnight the shipmen deemed"
Romans 13:12: "The  night is far spent, the day is at hand: let us therefore"
1 Corinthians 11:23: "Lord Jesus the  same night in which he was betrayed took bread:"
1 Thessalonians 2:9: "travail: for laboring  night and day, because we would not be chargable"
1 Thessalonians 3:10: " Night and day praying exceedingly that we might see"
1 Thessalonians 5:2: "as a thief in  the night."