ˈrōd.əˌsizəm noun
also rho·ta·cis·mus ˌ ̷ ̷ ̷ ̷ˈsizməs ; or ro·ta·cism ˈ ̷ ̷ ̷ ̷ˌsizəm
( -s )
Etymology: New Latin rhotacismus, from Middle Greek rhōtakizein to make too much or wrong use of the letter rho or r (from rhō rho) + Latin -ismus -ism — more at rho
1. : a defective pronunciation of r ; especially : substitution of some other sound for that of r
2. : the change of the sound z to r especially common between vowels (as in forlo r n [lo s e] or Latin gene r is [Sanskrit jana s as])