gutter [gutters](prepared channel in a surface) noun [UK: ˈɡʌ.tə(r)] [US: ˈɡʌ.tər]
machicolation(opening between corbels that support a projecting parapet, or in the floor of a gallery or the roof of a portal, of a fortified building) noun [UK: ˌmæ.tʃɪk.əʊ.ˈleɪ.ʃən] [US: mə.tʃɪk.ə.ˈleɪs.hən]