noun
: the ocean as contrasted with the neritic zone consisting of a photic zone which extends down as far as light penetrates with a twilight zone as its lower limit and an abyssal zone which extends thence to the bottom
noun
: the ocean as contrasted with the neritic zone consisting of a photic zone which extends down as far as light penetrates with a twilight zone as its lower limit and an abyssal zone which extends thence to the bottom
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012