dynastidanEntom.|dɪn-, daɪˈnæstɪdən| [f.mod.L. Dynastidæ, f.Dynastes as a generic name.] A member of the Dynastidæ, a family of large beetles including the Dynastes or Hercules-beetle. 1835Kirby Hab. & Inst.Anim. II. xx. 365 The mighty Dynastidans appear to feed upon putrescent timber.