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3.
From milli-, meaning one thousanth and Helen, the name of a beautiful woman from classic literature.

Unit for measuring beauty. One millihelen is the ammount of beauty that will launch exactly one ship.

Backround information: In the epic poem "The Illiad" by Homer, Helen of Troy is considered the most beautiful woman. Her beauty was the cause the Trojan war, because a man named Paris declaired her the most beautiful, and not one of the godesses. Because her beauty caused many men to go to war (in a society that revolved around the sea and boats), it can be said that her face was so beautiful it launched one thousand ships. So, one milli-Helen would be one thousanth of a Helen, or enough to launch one ship.

Alternate spelling: millihelen
This word was used by the character Zane in Scott Westerfeld's novel "Pretties":
Zane: "What would you give the view?"
Tally: "Give it?"
Zane: "A hundren milli-Helens? Five hundred? Maybe a whole Helen?"
Tally: "I'd give it none. It's Uglyville, after all."
by ofthestars1 June 06, 2009
 
1.
The quantity of beauty required to Launch one ship.
"Judith was no match for Helen of Troy, having on a few millihelens of beauty herself"
by great googly moogly January 01, 2004
 
2.
A face that could launch 1 ship.


excuse the first entry, it was misspelled!
Nice kid with a sweet personality; kinda plain tho'... a millihelen.
by Jeffry Finer December 16, 2003