Wordnet 3.0
NOUN (1)
1. 
 the outer germ layer that develops into skin and nervous tissue; 
[syn: ectoderm, exoderm, ectoblast]
WordNet (r) 3.0 (2006):
exoderm
    n 1: the outer germ layer that develops into skin and nervous
         tissue [syn: ectoderm, exoderm, ectoblast]