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Nocturnal describes an animal that is awake and active at night, and sleeps during the day. Owls, bats, and many cats are nocturnal. You can also use it about people, to say they like doing things at night and sleeping in the day.
夜行性的（動物在夜晚活動）
組成noct- (night, 夜晚) + -urnal (形容詞字尾，表示「跟…有關的」)
同家族的字
- nocturnenocturne 是一種「夜曲」，也來自表示「夜晚」的字根 noct-
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
nocturnaladj/nɒkˈtɜː.nəl/
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Of a person, creature, group, or species, primarily active during the night.
- nocturnal birds
- 2
Of an occurrence, taking place at night, nightly.
- a suspicious nocturnal outing
- Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins (Spinus pinus) undergo an irregular, nomadic type of nocturnal migration.
nocturnalnoun/nɒkˈtɜː.nəl/
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A person or creature that is active at night.
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historicalA device for telling the time at night, rather like a sundial but read according to the stars.
- A rather different instrument was the nocturnal: it enabled you to tell the time at night, provided you knew the date, from the position of the stars in the constellation of the Great Bear, which rotate around the Pole Star.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。