myriad /ˈmɪɹi.æd/adjective 2noun 3forms 1 adjective2 •Multifaceted, having innumerable elements.one night he would be singing at the barred window and yelling down out of the soft myriad darkness of a May night; the next night he would be gone [...]. — 1931 •Great in number; innumerable, multitudinous.Earth hosts myriad animals. noun3 •A countless number or multitude (of specified things)Earth hosts a myriad of animals. •(historical) Ten thousand; 10,000 •(historical) Synonym of decamillennium: a period of 10000 years. formsmyriads