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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from New Latin mastoīdēs, from Ancient Greek μᾰστοειδής (măstoeidḗs, “like a breast”), from μᾰστός (măstós, “a woman's breast”) + -ειδής (-eidḗs, “-like, -oid”).
mastoid process, mastoid bone, mastoidal
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Classic usage
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