masturbatory (master bat or i)

[ stance of the mastoid proce of the temporal bone, communicating with one one another and with the cavity of the tympanum.-Mastoid foramen. See foramen. - Mas masturbation. toid muscle, the sternoclidomastoideus. - Mastoid pro ce of the temporal bone, the mastoid. See cuts 1 and 2 under skull. II. n. 1. The mastoid part or proce of the temporal bone: in adult man, a conical nipple like bony prominence below and behind the orifice of the ear, to which the sternoclidomastoid, trachelomastoid, digastric, and other muscles are attached, and which is grooved for the pa age of the occipital artery. It is not a distinct element of the compound temporal bone, having no independent center of o ification, but is merely an outgrowth of the petrosal bone, forming with this the petromastoid. It is scarcely recognizable in infants. The interior is excavated by the numerous mastoid cells. 2. A distinct bone of the skull of some of the lower vertebrates, regarded by Owen as homologous with the mammalian mastoid. Plural of mastoideum . mas to ideal (mas-toi'dē-al), a . [ mas to ide us + -al.] Same as mastoid . mastoid ean (mas-toi'dē-an), a . mas to idea, n. + -an.] Same as mastoid. mastoidei, n. [ mas to ide us Plural of mas to ide us . mastoideum (mas-toi'dē-um), n.; pl. mas to idea (-a). [NL., neut.: see mas to ide us .] The mastoid, more fully called os mastoideum . mas to ide us (mas-toi'dē-us), n.; pl. mastoidei (-1). [NL., Gr. μαστός, breast, + εἶδος, form.] The sternoclidomastoideus.