續一切經音義 4.56

4.56

優曇（下徒含反梵語也或云烏曇應云優曇鉢羅此云妙瑞花或云祥瑞花人間本無天妙花也或時一見）。

優曇 (for the second character, [tán], fanqie 徒含 [d- + -ɑm = dɑm/tán]. A Sanskrit word; also written 烏曇; it should be udumbara, translated here as 'wondrously auspicious flower' or 'propitious flower'. It originally does not exist among humans, being a wondrous celestial flower, seen only once in an age.)