cephalothoracic

< /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

n.

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

adj.

1. Relating to the head and the chest.

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