What does "hypotrochoid" mean?

A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle.

How do you pronounce "hypotrochoid"?

Pronounced //ˌhaɪ.poʊˈtɹoʊ.kɔɪd//.

/ˌhaɪ.poʊˈtɹoʊ.kɔɪd/ noun

noun ·Rare ·Advanced level

Noun

1
A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle.

From hypo- + trochoid.