Entry 3 senses Webster, 1913 Pyxis /pĭk'-sĭs/ · Pyx·is · IPA /ˈpɪksɪs/ 01 n. A box; a pyx. 1. A box; a pyx. 2. A pyxidium.(Bot.) 3. The acetabulum. See Acetabulum, 2.(Anat.) See: Acetabulum