This is the 8258th most frequent Portuguese word.
tesouro
"Tesouro" means "treasure" in English.
In this sentence, 'tesouro' refers to a valuable collection of items, possibly gold or jewels, often hidden and to be discovered.
Ele encontrou um antigo tesouro enterrado na praia.
He found an old treasure buried on the beach.
Here, 'tesouro' is used metaphorically to signify that the book contains precious, invaluable knowledge.
Este livro é um verdadeiro tesouro de sabedoria.
This book is a true treasure of wisdom.
In this case, 'tesouro' describes an endearing and beloved person, indicating great emotional value rather than material wealth.