retromastoid

ret·ro·mas·toid

(ret'rō-mas'toyd), Posterior to the mastoid process; relating to the posterior mastoid cells.

retromastoid

(rĕt″rō-măs′toyd) [″ + Gr. mastos, breast, + eidos, form, shape] Behind the mastoid process.

ret·ro·mas·toid

(ret'rō-mas'toyd) Posterior to mastoid process.