Adjective mastoidal has 2 senses
  1. mastoidal - of or relating to or in the region of the mastoid process
  2. mastoid, mastoidal - relating to or resembling a nipple
,Noun mastoidal has 1 sense
  1. mastoid, mastoid process, mastoid bone, mastoidal - process of the temporal bone behind the ear at the base of the skull
    --1 is a kind of process, outgrowth, appendage
    --1 is a part of temporal bone, os temporale
    --1 has parts: mastoidale
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