Meaning of “mastoid” in the English Dictionary

"mastoid" in British English

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uk /ˈmæs.tɔɪd/ us /ˈmæs.tɔɪd/ specialized

relating to the mastoid process (= part of the skull just behind the ear):

Mastoidectomy is performed to remove infected air cells within the mastoid bone.

shaped like a breast or a nipple (= one of the two small darker parts that stick out from the breasts or chest)

(Definition of “mastoid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)