TgO Lev8:9 :וְשַוִי עַל מַצנַפתָא לִקבֵיל אַפוֹהִי יָת צִיצָא דְדַהבָא‏ : place the golden headplate on the turban against his face
See the entire entry for ṣyṣ n.m. high-priest's head-plate