plural La Niñas
Definition of La Niña
: an irregularly recurring upwelling of unusually cold water to the ocean surface along the western coast of South America that often occurs following an El Niño and that disrupts typical regional and global weather patterns especially in a manner opposite to that of El Niño
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Merriam-Webster unabridged
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Time Traveler for La Niña
The first known use of La Niña was in 1981
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