The Collaborative International Dictionary of English v.0.48:

Mesamoeboid \Mes`a*m[oe]"boid\ (m[e^]s`[.a]*m[=e]"boid), n.
   [Mes- + am[oe]boid.] (Biol.)
   One of a class of independent, isolated cells found in the
   mesoderm, while the germ layers are undergoing
   differentiation.
   [1913 Webster]