acephalocystic,a.|əˌsɛfələʊˈsɪstɪk| [f.prec. + -ic.] Belonging to, or of the nature of, acephalocysts. 1859Todd Cycl.Anat. & Phys. V. 26/1 Every thing that is known of the acephalocystic productions seems to point to the view that they are all nearly allied.