From HomoExcelsior

1. Relating to or situated on or close to the abdomen; abdominal. 2. Relating to or situated on or close to the anterior aspect of the human body or the lower surface of the body of an animal. 3. Of or on the lower or inner surface of an organ that faces the axis; adaxial. 4. A ventral fin. 5. The abdominal segment of an insect.

---