Wordnet 3.0
ADJECTIVE (1)
1. 
 of or relating to or characterized by neoteny; 
- Example: "neotenic development"[syn: neotenic, neotenous]
WordNet (r) 3.0 (2006):
neotenic
    adj 1: of or relating to or characterized by neoteny; "neotenic
           development" [syn: neotenic, neotenous]