A prefix meaning 'ten thousand' or 'countless,' used in scientific terms like 'myriad.'
From Greek myrios meaning 'countless' or literally 'ten thousand.' In ancient Greek, it represented the largest named number, beyond which quantities were considered infinite or uncountable.
The Greeks chose ten thousand as their word for 'countless' because it was roughly the size of a complete army, representing the largest organized group most people could conceptualize. This is why Xenophon's famous work about Greek mercenaries is called 'Anabasis of the Ten Thousand.'
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