ar·chi·me·des \ˌärkəˈmē(ˌ)dēz\noun Etymology: New Latin, from Archimedes died 212 b.c.; from the screwlike axis 1.capitalized: a genus of extinct colonial bryozoans having a spiral screwlike axis and being typical of Mississippian formations but known also from Pennsylvanian and Permain rocks 2.pluralarchimedes: any bryozoan or fossil of the genus Archimedes