clarion：中世纪的一种号角；号角声，清脆嘹亮的音响 

词根词缀： -clar-清楚,明白 + -ion名词词尾

• prepone
• preposition
• prepossessing
• preposterous
• prepotent
• preprandial
• pre-qualifying
• prequel
• pre-record
• preregister
• prerequisite
• prerogative
• presage
• presby-
• presbyter
• Presbyterian
• presbytery
• preschool
• prescient
• prescribe
• prescription
• prescriptive
• preselect
• presell
• presence