Definition of mastoid in English:



  • Relating to the mastoid process.

    ‘mastoid disease’
    • ‘The relationship between middle ear disease and mastoid development remains unclear although it is known that poor mastoid development is associated with middle ear disease.’
    • ‘Cholesterol granuloma is usually associated with chronic middle ear disease and is common in the mastoid antrum and air cells of the temporal bone.’
    • ‘Common to all of these patients is an abnormal connection between the sterile subarachnoid space, and the sinonasal region, middle ear cleft and mastoid cavity.’
    • ‘A review of the literature shows fluctuating trends in the numerous techniques that have been developed and used by otologists throughout the years of mastoid surgery.’
    • ‘A CT scan enables assessment of the degree of aeration of the middle ear cleft and mastoid cavity and a bone scan may detect osteomyelitis.’


  • 1Anatomy
    The mastoid process.

    • ‘Longstanding cholesteatomas expand to involve the mastoid, inner ear, and facial nerve.’
    • ‘They were implanted in the mastoid, frontal and maxillary regions for periods of 1 week to 2 months.’
    • ‘The group of patients underwent modified radical mastoidectomy because of the presence of a sclerotic mastoid with extensive cholesteatoma.’
    • ‘The mastoid was poorly developed, with a clear fluid effusion throughout with no evidence of cholesteatoma or inflammatory disease.’
    • ‘The temporal bone is the first bone to be affected, with imminent involvement of the petrous apex and mastoid.’
    1. 1.1informal treated as singular Mastoiditis.
      ‘stop poking your ears out with your biro—you'll get mastoids’


Mid 18th century via French and modern Latin from Greek mastoeidēs ‘breast-shaped’, from mastos ‘breast’.