Decahedron siffa ce mai girma uku mai siffar geometric mai fuska goma, kowanne daga cikinsu yana da gefe guda goma. Ma'ana, decahedron polyhedron ne mai fuska goma. Kalmar "decahedron" ta fito ne daga kalmomin Helenanci "deka," ma'anar "goma," da "hedra," ma'anar "tushe" ko "fuska."
