a large, bony prominence on the base of the skull behind the ear, containing air spaces that connect with the middle ear cavity.
mastoid process n.
A protruding bony area in the lower part of the skull that is located behind the ear in humans and many other vertebrates and serves as a site of muscle attachment. The mastoid process contains small air-filled cavities called mastoid cells that communicate with the middle ear.
[mas-toid] /ˈmæs tɔɪd/ adjective, Anatomy. 1. of or relating to the . 2. resembling a breast or nipple. noun 3. the . /ˈmæstɔɪd/ adjective 1. shaped like a nipple or breast 2. designating or relating to a nipple-like process of the temporal bone behind the ear noun 3. the mastoid process 4. (informal) mastoiditis adj. […]
- Mastoid sinus
mastoid sinus n. Any of numerous air-filled spaces of various sizes in the mastoid process. Also called mastoid cell.
mastoncus mas·ton·cus (mas- tong’kŭs) n. a tumor or swelling of the breasts
masto-occipital mas·to-oc·cip·i·tal (mās’tō-ŏk-sĭp’ĭ-tl) adj. Relating to the mastoid portion of the temporal bone and to the occipital bone.