viaductviaduct /ˈvaɪəˌdʌkt/ noun [countable] 
a long high bridge across a valley that has a road or railroad track on it
a long high bridge across a valley that has a road or railroad track on it- sectarian
- sectarianism
- section
- sectional
- sectionalism
- sector
- secular
- secularism
- secularist
- secularization
- secularize
- secure
- secured
- securely
- Securities and Exchange Commission, the
- security
- security blanket
- security clearance
- security deposit
- security force
- security guard
- security light
- security risk
- security service
- secy.