Maybe we will find this word in the dictionary? Of course, no.
It will be easy to see what this word is if we know noun זְמַן, time > ptr N-t017.A.1
When noun זְמַן takes suffix ם, then we get זְמַנָּם / זמנם, their time (of males).
It is not found in the Bible.
Look at ptr S-t1543