ˈsustinent,a.andn.rare. [ad. L. sustinentem, -ens, pr.pple. of sustinēre to sustain.] A.adj. Sustaining. †B.n. Support. 1603J. Davies Microcosmos (1878) 70/1 And our right Arme the Weedowe's Sustinent.1876Dowden Poems 13 Gather me close in tender, sustinent arms.