Webster's English Dictionary

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ectoderm

ec.to.derm or ec.to.der.mic \'ek-t*-.d*rm\ \.ek-t*-'d*r-m*l\ \-mik\ n [ISV 
   ect- + Gk derma skin - more at DERM-] 1: the outer cellular membrane of a 
   diploblastic animal  2a: the outermost of the three primary germ layers of 
   an embryo  2b: a tissue (as neural tissue) derived from this germ layer  - 
   ec.to.der.mal aj