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1.
The longest night of the year in the persian language, Iranians celebrate this night (Shabe-Yelda) by staying up late while eating fruit and nuts and welcoming longer days to the warmth of the spring. Happy Yelda!
Yelda Spring flower welcome longerdays
by Lena1995 September 21, 2013
 
2.
Russian word for penis.

(Used especially often in the game Destroy All Humans 2.)
Russian peasent: After that nuclear reactor went online, my yelda hurts and my pee is green.

Russian worker: Agent Sovetski is so dreamy. But I have nothing to offer him but sadness, poverty, and dispair! Oh, and yelda.
by Kevin July 18, 2008