sustentacular,a.|sʌstɛnˈtækjʊlə(r)| [f. next + -ar.] Pertaining to or of the nature of a sustentaculum; supporting. 1890Billings Nat.Med.Dict., Sustentacular fibres, Müller's fibres.1897Allbutt's Syst.Med. III. 676 The sustentacular ligaments of the peritoneum.