< /ˌsɛf ə loʊˈθɔr əˌsiz, -ˈθoʊr-/. Zoology.
- the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.
noun plural -raxes or -races (-rəˌsiːz)
- the anterior part of many crustaceans and some other arthropods consisting of a united head and thorax
- The combined head and thorax of arachnids, such as spiders, and of many crustaceans, such as crabs.