Significados de adamantine gates en inglés

From time to time the adamantine gates fell ajar, and in we slipped.

Now will I burn the husks, and thou, O Artemis, hast power to move hell's adamantine gates, and all else that is as stubborn.

Mystic Hades, Holder of the Keys of Earth, Incline Thy sacred ear, unlock Thy deep and adamantine gates, and bring abundant fruits to bear.