An inhabitant of the western lands / The Hesperian geological time period of Mars

Of or relating to the land where the sun sets; western / Of or relating to the Hesperides nymphs / of or relating to the Martian geological period between Noachian and Amazonian

plural of Hesperian

Of or relating to the Hesperiidae family of butterflies.

Any butterfly of the family Hesperiidae; a skipper

The second of the three Martian geologic epochs, approximately from 3,500 million years ago to 1,800 million years ago, marked by lava flows, preceded by the Noachian epoch, and followed by the Amazonian epoch.