Mould/məʊld/ Definition 1 of 5Pro Tip 1/3Crafting Shapes Used when discussing making objects, especially in DIY or industrial contexts. The molten glass is poured into the mould to make vases. Pro Tip 2/3Final Form When set, the material takes the mould's shape permanently unless broken. When the concrete dried, it took the mould's appearance. Pro Tip 3/3Not Just Solids Moulds can shape liquids or foods that set, not only metals or plastics. We used chocolate moulds for our dessert preparations.