τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
from שָׂרַד; a survivor: X alive, left, remain(- ing), remnant, rest.the same as שָׂרִיד; Sarid, a place in Palestine: Sarid.
