moulding
/ˈməʊldɪŋ/( <美> molding)
noun
1- an ornamentally shaped outline as an architectural feature, especially in a cornice（尤指檐口的）建筑装饰线条。
1.1
- mass noun material such as wood, plastic, or stone shaped for use as a decorative or architectural feature建筑装饰线条材料。