Dictionary Definition :
Definition[1]
:
The udumbara flower which flowers but once in 3, 000 years; v. 優.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
(雜語)謂優曇華也。法華經方便品曰:「如是妙法諸佛如來,時乃說之,如優曇缽華,時一現耳。」文句四曰:「優曇華,此言靈瑞,三千年一現,現則金輪王出。」
Source
:
丁福保《佛學大辭典》