James Strong, Strong's Exhaustive Concordance of the Bible… (1890)
“ Mysia.3365 μυστήριον (moos-tay'-ree-on) : from a derivative of muo (to shut the mouth) ; a secret or "mystery" (through the idea of silence imposed by initiation into religious rites) : mystery.3366 μυωπάζω (moo-ope-ad'-zo) : from a compound of the base of μυστήριον and ops (the face; from ὀπτάνομαι) ; to shut the eyes, i.e. blink (see indistinctly) : cannot see far off. ”
