paedomorphism

n.

Retention of juvenile characteristics in the adult, occurring in mammals.
Description of adult behavior in terms appropriate to child behavior.

Related formspae′do•morphic (-fĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.