testudinian,a.andn.Zool.|tɛstjuːˈdɪnɪən| [f. L. testūdin-em tortoise + -ian.] a.adj. Of or pertaining to tortoises. b.n. A member of the tortoise family. 1854Owen Skel. & T. in Orr's Circ.Sc. I. Org.Nat. 213 Side-walls..are added in the..land-tortoises (testudinians).