From sternum (“the breastbone”) + Ancient Greek κλείς (kleís, “the collarbone”) + mastoīdēs (“like a breast”). Doublet of sternocleidomastoīdeus.
sternocleidomastoīdēs (neuter sternocleidomastoīdes or sternocleidomastoīdēs); third-declension one-termination adjective (Greek-type) (New Latin)
Third-declension one-termination adjective (Greek-type).
singular | plural | ||||
---|---|---|---|---|---|
masc./fem. | neuter | masc./fem. | neuter | ||
nominative | sternocleidomastoīdēs | sternocleidomastoīdes1 sternocleidomastoīdēs |
sternocleidomastoīdēs | sternocleidomastoīda sternocleidomastoīdia2 | |
genitive | sternocleidomastoīdis | sternocleidomastoīdum sternocleidomastoīdium2 | |||
dative | sternocleidomastoīdī | sternocleidomastoīdibus | |||
accusative | sternocleidomastoīdem | sternocleidomastoīdes1 sternocleidomastoīdēs |
sternocleidomastoīdēs | sternocleidomastoīda sternocleidomastoīdia2 | |
ablative | sternocleidomastoīde sternocleidomastoīdī2 |
sternocleidomastoīdibus | |||
vocative | sternocleidomastoīdes1 sternocleidomastoīdēs |
sternocleidomastoīdēs | sternocleidomastoīda sternocleidomastoīdia2 |
1It is unknown if Classical Latin preserved (or would have preserved) the shortness of the original Greek short ending.
2It is unknown whether adjectives of this type would use i-stem or consonant-stem endings in Classical Latin: the relevant forms are not attested. Depending on the word, either ending or both may be attested in New Latin.