Branch of Mathematics That Means "pebble" in Latin

This page is the CodyCross answer for the clue below from New York, New York!, Group 369, Puzzle 2 (Iconic Skyline).

Question is: Branch of Mathematics That Means "pebble" in Latin

and the answer is: CALCULUS

Word Meaning:

CALCULUS — (dated, countable) Calculation; computation.

Definitions from Wiktionary.

Branch of mathematics that means "pebble" in Latin — CodyCross Answer | CodyCross Solutions