from Wiktionary, Creative Commons Attribution/Share-Alike License
- innumerable: myriad, myriapod
- In the metric systems of units, multiplying the unit to which it is attached by 10,000. Symbol: my
from the GNU version of the Collaborative International Dictionary of English
- A prefix, esp. in the metric system, indicating ten thousand, ten thousand times.
From Ancient Greek μυρίος (murios, "ten thousand"). (Wiktionary)