From HomoExcelsior

n. 1. One of the two major body divisions of a spider. 2. The rear or posterior body part of a spider. 3. The part of a spider composed of the fusion of the abdominal segments into a single, soft and usually rounded or cylindrical structure, joined to the cephalothorax anteriorly by the narrow pedicel, and with the spinnerets posteriorly. Syn: abdomen.

---