Relating to or affecting both mastoid processes (bone structures behind the ears).
From Greek 'bi-' (two) + 'mastos' (breast) + '-oid' (resembling). The mastoid process was named because it resembles a breast; 'bimastoid' describes conditions affecting both sides.
The mastoid bone has a honeycomb structure that can trap infections, and when both sides get infected (bimastitis), it's serious—but modern antibiotics have made this rare!
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