BT Pes 85b(34) :והלילא פקע באגרא‏ : (the din of) the Hallel split the roof
See the entire entry for ˀeggār, ˀeggārā n.m. wall; roof

BT Pes 85b(34) :כי זייתא פסחא‏ : an olive-sized piece of the Paschal lamb
See the entire entry for zayt, zaytā n.m. olive

BT Pes 85b(34) :והלילא פקע באגרא‏ : (the din of ) the Hallel split the roof
See the entire entry for pqˁ vb. to split, to burst open