Etymology
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night-crawler (n.)

"large earthworm caught at night to be used as bait by anglers," by 1896, American English, from night (n.) + agent noun from crawl (v.).

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night-work (n.)

"work done during the night," 1590s, from night + work (n.). Old English had nihtweorc.

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twi-night (adj.)
1939, in reference to evening double-header baseball games, from twilight + night.
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Walpurgis night 

1820, from German Walpurgisnacht, witches' revel, especially on the Brocken in the Harz Mountains, on May-day eve, literally "the night of (St.) Walpurgis," from Walburga, English abbess who migrated to Heidenheim, Germany, and died there c. 780; May 1 being the day of the removal of her bones from Heidenheim to Eichstädt.

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night-owl (n.)
"owl which flies at night," 1590s; applied since 1846 (American English) to persons who are up or out late at night. Compare night-hawk, also French hirondelle de nuit "prostitute," literally "night-swallow."
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fly-by-night (n.)
1796, slang, said by Grose to be an old term of reproach to a woman signifying that she was a witch; used from 1823 in reference to anyone who departs hastily from a recent activity, especially while owing money. The different senses involve the two verbs fly.
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sightseeing (n.)
also sight-seeing, 1821, from sight (see sights) + present participle of see (v.). Sight-see (v.) is from 1824. Sight-seer first recorded 1821.
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noct- 

also nocti-, word-forming element meaning "night, by night, at night," from Latin nox (genitive noctis) "night," from PIE *nekwt- "night" (see night).

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sighting (n.)
"instance of catching sight," 1853, verbal noun from sight (v.).
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visual (adj.)
early 15c., "pertaining to the faculty of sight;" also "coming from the eye or sight" (as a beam of light was thought to do), from Late Latin visualis "of sight," from Latin visus "a sight, a looking; power of sight; things seen, appearance," from visus, past participle of videre "to see" (see vision). Meaning "perceptible by sight" is from late 15c; sense of "relating to vision" is first attested c. 1600. The noun meaning "photographic film or other visual display" is first recorded 1944.
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