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From The Collaborative International Dictionary of English v.0.48:
Noctuid \Noc"tu*id\, n. [From L. nox, noctis, night.] (Zool.) Any one of numerous moths of the family Noctuidae, or Noctuaelitae, as the cutworm moths, and armyworm moths; -- so called because they fly at night. -- a. Of or pertaining to the noctuids, or family Noctuidae. [1913 Webster]