tour billion

tourbillion

[toor-bil-yuhn]
noun
1.
a whirlwind or something resembling a whirlwind.
2.
a firework that rises spirally.
3.
Horology. a frame for the escapement of a timepiece, especially a watch, geared to the going train in such a way as to rotate the escapement about once a minute in order to minimize positional error.
Compare karrusel.


Origin:
1470–80; earlier turbilloun < Middle French to(u)rbillon < Vulgar Latin *turbiliōnem, dissimilated variant of *turbiniōnem, accusative of *turbiniō whirlwind. See turbine, -ion

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World English Dictionary
tourbillion (tʊəˈbɪljən)
 
n
a rare word for whirlwind
 
[C15: from French tourbillon, ultimately from Latin turbō something that spins, from turbāre to confuse]

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