Myriad is a noun that refers to an extremely great number.

Our word of the day is derived from the Greek word myrios (MEER ee ose) which refers to the number ten thousand. Over time this evolved into a reference to any extremely large number. Myriad can sometimes be used as an adjective that basically has the same meaning. As a noun we would say: Chuck had a myriad of options when he graduated from an Ivy League college.

As an adjective, we’d say: When Chuck graduated from an Ivy League college, his options were myriad.