molding
US /ˈmoʊl.dɪŋ/
UK /ˈmoʊl.dɪŋ/

1.
a shaped strip of wood or other material used as a decorative architectural feature, typically around the top of a wall or door
:
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The old house had intricate wooden molding around the ceilings.
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We need to replace the damaged crown molding in the living room.
2.
the action or process of shaping something
:
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The clay required careful molding to achieve the desired shape.
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The artist specialized in the molding of intricate sculptures.