sternocleidomastoideus

Borrowed from New Latin sternocleidomastoīdeus, clipping of mūsculus sternocleidomastoīdeus (“sternocleidomastoid muscle”).

• (General American) IPA^(key): /ˌstɝ.nəˌklaɪ.dəˌmæˈstɔɪ.di.əs/
• Rhymes: -ɔɪdiəs

sternocleidomastoideus (plural sternocleidomastoidei)

1. (anatomy) Alternative form of sternocleidomastoid muscle.

• “sternocleidomastoideus”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.

From sternum (“the breastbone”) +‎ Ancient Greek κλείς (kleís, “the collarbone”) +‎ mastoīdēs (“like a breast”) +‎ -eus (adjectival suffix). Doublet of sternocleidomastoīdēs.

• (Classical) IPA^(key): /ster.no.klei̯.do.mas.toˈiː.de.us/, [s̠t̪ɛrnɔkɫ̪ɛi̯d̪ɔmäs̠t̪oˈiːd̪eʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ster.no.klej.do.mas.toˈi.de.us/, [st̪ernoklejd̪omäst̪oˈiːd̪eus]

sternocleidomastoideus (feminine sternocleidomastoidea, neuter sternocleidomastoideum); first/second-declension adjective (New Latin)

1. (anatomy) sternocleidomastoid

   mūsculus sternocleidomastoīdeus ― sternocleidomastoid muscle

First/second-declension adjective.

• → English: sternocleidomastoideus