Main Ingredient Used to Make Mortar

This page is the CodyCross answer for the clue below from Larger than Life, Group 2147, Puzzle 4 (Terracotta Army).

Question is: Main Ingredient Used to Make Mortar

and the answer is: CEMENT

Word Meaning:

CEMENT — (countable, uncountable) A powdered substance produced by firing (calcining) calcium carbonate (limestone) and clay that develops strong cohesive properties when mixed with water. The main ingredient of concrete.

Definitions from Wiktionary.