myriad

Ten thousand; 10,000historical

Ten thousand; 10,000; Synonym of decamillennium: a period of 10000 years.historical

A countless number or multitude (of specified things)

• Earth hosts a myriad of animals.

Multifaceted, having innumerable elements.not-comparable

• "As a clinician, it's a difficult symptom to treat," Cornelius said. "The end symptom may be the same, but what's causing it may be myriad."

Great in number; innumerable, multitudinous.not-comparable

• Earth hosts myriad animals.