This is the 16174th most frequent Russian word.
раковых
"Раковых" means "of cancer" or "cancerous" when referring to tumors, or "crayfish" in the context of the plural form related to crayfish.
The word 'раковых' is used as an adjective, modifying the noun 'шейки' to specify the type of 'tails' — those of crayfish.
В меню ресторана были раковые шейки.
The restaurant menu featured crayfish tails.
Here, 'раковых' functions as an adjective to describe 'клеток' (cells), indicating cells related to cancer.
Ученые изучают природу раковых клеток.
Scientists study the nature of cancer cells.
In this sentence, 'раковых' is an adjective describing 'гор' (hills), indicating a thematic or locational association with crayfish.