1) How to say "Myriad"
  1. Press your lips together as you push air out of your mouth
  2. Open your lips and press your teeth together
  3. Use your cheeks to widen your mouth
  4. Open your teeth begin pushing air from further back in your throat
  5. Quickly bounce your tongue off the roof of your mouth as you push air from the back of your throat

2) Myriad originated when a Greek scout found a large enemy army. He rushed back to his commanders to report the news, but he was so tired, that he could not quite spit out the word myria, which meant ten thousand, to describe the number of soldiers in the enemy army. The scout was so tired that he passed out in the middle of saying myria, and when his face hit the ground, a 'd' sound was forced out of him. Ever since, people have used 'myriad' to describe a large number of different things.

3) Etymology
Noun. 1) a very large number of things 2) ten thousand of something
-origin: Greek, from myrioi countless, ten thousand; first known use: 1555