| equinoctial | (adjective) relating to an equinox (when the lengths of night and day are equal) | - |
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| (adjective) relating to the vicinity of the equator | - |
| (noun) the great circle on the celestial sphere midway between the celestial poles | Synonyms: celestial equator, equinoctial circle, equinoctial line |
| noctambulation | (noun) walking by a person who is asleep | Synonyms: noctambulism, sleepwalking, somnambulation, somnambulism |
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| noctambulism | (noun) walking by a person who is asleep | Synonyms: noctambulation, sleepwalking, somnambulation, somnambulism |
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| noctambulist | (noun) someone who walks about in their sleep | Synonyms: sleepwalker, somnambulist |
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| noctiluca | (noun) large bioluminescent marine protozoan | Synonyms: Noctiluca miliaris |
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| noctilucent | (adjective) shining or glowing by night | - |
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| noctuid | (noun) usually dull-colored medium-sized nocturnal moth; the usually smooth-bodied larvae are destructive agricultural pests | Synonyms: noctuid moth, owlet moth |
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| nocturia | (noun) excessive urination at night; especially common in older men | Synonyms: nycturia |
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| nocturnal | (adjective) belonging to or active during the night | - |
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| (adjective) of or relating to or occurring in the night | - |
| nocturnally | (adverb) at night | - |
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| nocturne | (noun) a pensive lyrical piece of music (especially for the piano) | Synonyms: notturno |
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