Definition of mesonoxian in English:
mesonoxian
adjective mɛsə(ʊ)ˈnɒkʃ(ə)nmiːsə(ʊ)ˈnɒkʃ(ə)nmɛzə(ʊ)ˈnɒkʃ(ə)n
rare Of or relating to midnight.
Origin
Early 17th century; earliest use found in Henry Cockeram (fl. 1623–1658), lexicographer. From ancient Greek μεσο- meso- + classical Latin nox night + -ian.