mastoid

adjective
mas·​toid | \ ˈma-ˌstȯid How to pronounce mastoid (audio) \

Definition of mastoid

 (Entry 1 of 2)

1 : being the process of the temporal bone behind the ear also : being any of several bony elements that occupy a similar position in the skull of lower vertebrates
2 : of, relating to, or occurring in the region of the mastoid process

mastoid

noun

Definition of mastoid (Entry 2 of 2)

: a mastoid bone or process

Examples of mastoid in a Sentence

Recent Examples on the Web: Adjective Before putting on the headset, a Modius worker used an alcoholic wipe to clean the skin along the mastoid bone behind my ears and then affix an adhesive pad with electrodes. Edward C. Baig, USA TODAY, "This headset is supposed to help you lose weight the easy way," 25 Feb. 2018 A doctor said Hoffman had damaged his mastoid bone and required surgery. Shari Rudavsky, Indianapolis Star, "He would wake up with a wet pillow and ear. But he never would have guessed what that fluid was.," 15 May 2017 Recent Examples on the Web: Noun A doctor tried to resolve the problem with an operation on the mastoid that left him deaf in one ear. Frederick N. Rasmussen, baltimoresun.com, "Dr. Hilbert M.'Bert' Levine, retired Baltimore general surgeon," 17 Aug. 2017 Part of the rear of the skull called the mastoid bears some telltale otter traits, Natural History Museum of Los Angeles paleontologist Xiaoming Wang and colleagues write, but the first molar— Brian Switek, Smithsonian, "You Wouldn’t Want to Cuddle This Giant Prehistoric Otter With a Crushing Bite," 23 Jan. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mastoid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of mastoid

Adjective

1732, in the meaning defined at sense 1

Noun

1840, in the meaning defined above

History and Etymology for mastoid

Adjective

borrowed from New Latin mastoīdēs, borrowed from Greek mastoeidḗs "like a breast or nipple" (in mastoeideîs apophýseis "mastoid processes," from the nipple-like protuberance formed by the bone), from mastós "breast, nipple" (probably from a pre-Greek substratal language) + -oidēs -oid entry 1

Noun

by ellipsis from mastoid process, mastoid bone, etc.

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Time Traveler for mastoid

Time Traveler

The first known use of mastoid was in 1732

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Cite this Entry

“Mastoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mastoid. Accessed 21 Sep. 2020.

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More Definitions for mastoid

mastoid

adjective
mas·​toid | \ ˈmas-ˌtȯid How to pronounce mastoid (audio) \

Medical Definition of mastoid

 (Entry 1 of 2)

: of, relating to, or being the mastoid process also : occurring in the region of the mastoid process

mastoid

noun

Medical Definition of mastoid (Entry 2 of 2)

: a mastoid bone or process

More from Merriam-Webster on mastoid

Britannica.com: Encyclopedia article about mastoid

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