1) Serving to sustain or support 2) Support 3) Supporting 
supporting
• (a.) Supporting; sustaining; as, a sustentacular tissue.
Sus`ten·tac'u·lar adjective [ See Sustenance .] (Anat.) Supporting; sustaining; as, a sustentacular tissue. 
Type: Term Pronunciation: sŭs′ten-tak′yū-lăr Definitions: 1. Relating to a sustentaculum; supporting.
[adj] - serving to sustain or support
sustentacular Pertaining to or of the nature of a sustentaculum; supporting.
adjective serving to sustain or support; `sustentacular cells`
supporting.