This is the 18149th most frequent Russian word.
цветах
"Цветах" means "flowers" (prepositional case, plural) in English.
Here, 'цветах' is used in the prepositional case to indicate the topic of the book.
Я читаю книгу о цветах.
I’m reading a book about flowers.
In this sentence, 'цветах' is in the prepositional case, describing the location of the flowers in which the children are playing.
Дети играют на поляне в цветах.
The children are playing in a meadow among flowers.
Here, 'цветах' is used metaphorically in the prepositional case to indicate the manner (bright colors) of the room's decoration.