a combining form meaning “night,” used in the formation of compound words: noctilucent.
Also, especially before a vowel, noct-.

< Latin nocti-, combining form of nox night Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nocti- or (before a vowel) noct-
combining form
night: noctilucent
[from Latin nox, noct-]
noct- or (before a vowel) noct-
combining form
[from Latin nox, noct-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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