mesos (Greek #3319)
middle (as an adjective or (neuter) noun)
KJV usage: among, X before them, between, + forth, mid(-day, -night), midst, way.
Pronounce: mes'-os
nux (Greek #3571)
"night" (literally or figuratively)
KJV usage: (mid-)night.
Pronounce: noox
Origin: a primary word