myria- (my-)
myria- (my-) :
A metric prefix meaning 10 000. This prefix was part of the original metric system of 1795 and was used throughout the nineteenth and early twentieth centuries. It has been obsolete officially since 1960, when the CGPM adopted the standard list of SI prefixes. The ancient Greek word myrios means countless, without number. This was modified by later Greeks to form a word myrioi meaning ten thousand. The word myriad, generally used today to mean an indefinitely large number, originally meant the number 10 000
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