from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.
- proper n. The Siderian period.
Sorry, no etymologies found.
In 2007, for instance, he was appointed to the advisory board of Siderian, a San Francisco-based venture capital firm specialising in 'sustainable technologies', where he was expected to provide the Fund with 'access, standing and industrial exposure at the highest level',