cephalothorax

< /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

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