○vistara m. great extent, plenty, abundance (○raṃ-√yā, 'to be richly supplied, become full') Subh
• great diffuseness (○rāt, 'very fully, in great detail') Pañcar
• mf(ā)n. very extensive or large MBh. Kathās
• very great or strong or intense MBh. Kāv. &c
• (am), ind. in great detail, at full length Pañcar. Hit
• very intensely or vehemently R. Hariv

Sanskrit-English Dictionary, by M. Monier William