skiagraphy

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ski·ag·ra·phy / skīˈagrəfē/ (Brit. sci·ag·ra·phy) • n. the use of shading and the projection of shadows to show perspective in architectural or technical drawing.DERIVATIVES: ski·a·gram / ˈskīəˌgram/ n.ski·a·graph / ˈskīəˌgraf/ n. & v.ski·a·graph·ic / ˌskīəˈgrafik/ adj.