Source : Webster's Revised Unabridged Dictionary (1913)

Filipendulous \Fil`i*pen"du*lous\ (?; 135), a. [L. filum a
   thread + pendulus hanging, fr. pend?re to hang.] (Bot.)
   Suspended by, or strung upon, a thread; -- said of tuberous
   swellings in the middle or at the extremities of slender,
   threadlike rootlets.