< /ˌsɛf ə loʊˈθɔr əˌsiz, -ˈθoʊr-/. Zoology.

  1. the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.

noun plural -raxes or -races (-rəˌsiːz)

  1. the anterior part of many crustaceans and some other arthropods consisting of a united head and thorax

1829, from cephalo- + thorax. Perhaps from French or German.

  1. The combined head and thorax of arachnids, such as spiders, and of many crustaceans, such as crabs.
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