The Collaborative International Dictionary of English v.0.48:

Ectosarc \Ec"to*sarc\, n. [Ecto- + Gr. ?, ?, flesh.] (Biol.)
   The semisolid external layer of protoplasm in some
   unicellular organisms, as the am[oe]ba; ectoplasm; exoplasm.
   [1913 Webster]