No. A mortar is a indirect fire weapon where as a railgun is a direct-fire weapon.

In Polish language it means either "mortar" as weapons ( indirect fire weapon that fires explosive projectiles known as mortar bombs at low velocities and short ranges) or "mortar and pestle" as used in kitchen or pharmacy.

The tank and the automatic rifle and grenades and larger mortar fire are the most dangerous weapons. The most dangerous chemical weapon was the mustard gas the Germans used.

As a chemical weapon (the original purpose) there was no replacement, due to removal of chemical weapons from the inventory. As a mortar, it was replaced by the current 81mm mortar, which has a much longer range than the earlier 81mms.

There's also a 120mm smoothbore mortar which replaced some of the 4.2 mortars. It's more commonly found in mechanized units, as it would be quite cumbersome to carry by foot.

Mortar. Although mortar that dries whilst packing around stonework will adhere the stones to form a structure.