silphium /silˈfi-əm/

1. A plant (perh the umbelliferous Ferula tingitana) imported from Cyrenaica by the Greeks for use as a food and in medicine (historical)
2. (cap) a genus of American composites, compass plants

• spiraster
• spirasters
• spirated
• spiration
• spirations
• spire
• spirea
• spireas
• spired
• spireless
• spireme
• spiremes
• spires
• spire-steeple
• spire-steeples
• spirewise
• spiric
• spirics
• spirier
• spiriest
• spirilla
• spirillar
• spirilloses
• spirillosis
• spirillum