ˈsīənə noun
Usage: capitalized
Etymology: New Latin, from Greek kion-, kiōn pillar; akin to Armenian siun pillar
: a genus (coextensive with the family Cionidae) comprising relatively large simple ascidians and including a single cosmopolitan species ( C. intestinalis )
• ci·o·nid ˈsīənə̇d, -ˌnid adjective or noun