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Adjective: mastoidal  ma'stoy-dul
  1. Relating to or resembling a nipple
    - mastoid
Noun: mastoidal  ma'stoy-dul
  1. Process of the temporal bone behind the ear at the base of the skull
    - mastoid, mastoid process, mastoid bone

Type of: appendage, outgrowth, process

Part of: os temporale, temporal bone