Zephyrean refers to a wind or breeze that is soft and pleasant. If a zephyrean breeze were to come through the window of your hot, stuffy bedroom on a summer night, it would give you a nice, gentle moment of relief.
There was a time when only breezes coming from the west would be called zephyrean. That’s because in Greek mythology Zephyr was the god of the west wind, often known as a helpful and gentle wind. Now we think of any gentle, refreshing breeze as zephyrean, even if it comes from the east. This would not have pleased Zephyr’s brother Eurus, the god of the east wind, known as the wind of storms, able to toss ships at sea — not very zephyrean, that’s for sure!