hypotrochoid UK /ˌhaɪ.pə(ʊ)ˈtɹəʊ.kɔɪd/US /ˌhaɪ.poʊˈtɹoʊ.kɔɪd/ noun1 •A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle. formshypotrochoids
