Source : Webster's Revised Unabridged Dictionary (1913)

Interdigitate \In`ter*dig"i*tate\, v. t.
   To interweave. [R.]

Interdigitate \In`ter*dig"i*tate\, v. i. [Pref. inter- + L.
   digitus finger.]
   To interlock, as the fingers of two hands that are joined; to
   be interwoven; to commingle. --Owen.