a combining form meaning “10,000,” used especially in the names of metric units equal to 10,000 of the unit denoted by the base word: myriagram; myriameter.
Origin of myria-
combining form representing Greek mȳriás ten thousand; see myriad
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
indicating a very great numbermyriapod
Word Origin for myria-
from Greek murios countless
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012