One of the sonant mutes /, /, / (b, d, g), in Greek, or of
   their equivalents in other languages, so named as intermediate between
   the tenues, /, /, / (p, t, k), and the aspiratae (aspirates) /, /, /
   (ph or f, th, ch). Also called middle mute, or medial, and sometimes
   soft mute.