PTŠab 11.a:37[2] :עד עצרתא‏ : until Shavuot
See the entire entry for ˁaḏ prep. until

PTŠab 11.a:37[2] :ארבעתי כסוי דלילי פיסחא‏ : the four cups of Passover night
See the entire entry for psaḥ, pisḥā n.m. Passover