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A small stone or pebble, typically smooth and round.
Les enfants ont construit un château de sable avec des cailloux.
The children built a sandcastle with pebbles.
The term is commonly used in everyday language to refer to small stones found in nature.
In French, 'caillou' is often used in expressions involving children playing outdoors or describing natural landscapes.
From Old French 'caillou', meaning 'small stone', derived from the Latin 'calculus', meaning 'pebble'.
The term is often used in a playful or descriptive context, especially in children's language or nature-related discussions.