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Noun1.Mastoidal - process of the temporal bone behind the ear at the base of the skullmastoidal - process of the temporal bone behind the ear at the base of the skull
mastoidale - the craniometric point at the lowest point of the mastoid process
os temporale, temporal bone - a thick bone forming the side of the human cranium and encasing the inner ear
appendage, outgrowth, process - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process"
Adj.1.Mastoidal - relating to or resembling a nipplemastoidal - relating to or resembling a nipple  
References in periodicals archive ?
Three platinum-coated electrodes were placed under the dermis, specifically the positive electrode in the vertex, the ground electrode in the apex nasi, and the negative electrode in the ipsilateral mastoidal dermis.
Although it is seen more rarely, temporal bone osteomas can originate from other regions such as squamous and mastoidal parts, internal and external auricular canals,glenoid foss, middle ear, eustachian tube, petrous apex and styloid process.1-3
EEG was recorded continuously during the entire study using unipole placement on 10 regions of the cortex: symmetrical frontal (F3, F4), temporal (T3, T4), central (C3, C4), parietal (P3, P4) and occipital (O1, O2), using the 10 x 20 system, relative to the combined referential electrodes, which were located on the mastoidal bones of the skull.