Standard Lemma guide

sternocleidomastoid

adj · noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • Received-Pronunciation: /ˌstɜː.nə(ʊ)ˌklʌɪ.də(ʊ)ˈma.stɔɪd/
  • General-American: /ˌstɝ.nəˌklaɪ.dəˈmæˌstɔɪd/
  • rhymes with -æstɔɪd

1

adj

Meaning 1

Relating to or involving the sternum, the clavicle and the mastoid process of the temporal bone.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: anatomy, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Of or pertaining to the sternocleidomastoid muscle.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: anatomy, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

Ellipsis of sternocleidomastoid muscle.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, ellipsis

Topics: anatomy, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: sternocleidomastoid muscle, sternocleido mastoideus, musculus sternocleidomastoideus

Antonyms: none provided

Broader terms: skeletal muscle, striated muscle

History

Etymology

Borrowed from New Latin sternocleidomastoīdēs, from Latin sternum (“the breastbone”) + Ancient Greek κλείς (kleís, “the collarbone”) + Latin mastoīdēs (“like a breast”), equivalent to sterno- + cleido- + mastoid.

Across languages

Translations

3 source translations are retained for this English entry.

  • Italian: sternocleidomastoideo — pertaining to the sternocleidomastoid muscle
  • Portuguese: esternocleidomastóideo — pertaining to the sternocleidomastoid muscle
  • Spanish: esternocleidomastoideo — pertaining to the sternocleidomastoid muscle