熱ねつ外がい中ちゅう性せい子しねつがいちゅうせいしMeanings1nounepithermal neutronTechnical term in nuclear physics and engineering for neutrons with kinetic energy above thermal neutrons (typically >0.025 eV) but below fast neutrons.熱ねつ外がい中ちゅう性せい子しは、原げん子し炉ろの制せい御ぎょにおいて重