noun
young turtle; baby turtle
Refers to a turtle or tortoise that is still young, often small and cute.
海岸で亀の子を見つけた。
I found a baby turtle on the beach.
noun
turtle shell; tortoise shell
The hard outer shell of a turtle or tortoise. Can also refer to the shell of a young turtle, but the term itself simply means 'turtle shell'.
I polished the turtle shell until it was clean.
Compound of 亀 (kame, 'turtle') + の (no, possessive particle) + 子 (ko, 'child'). Literally 'child of a turtle', referring to a young turtle or, by extension, its shell.