puer·il·ism 
(pyrə-lĭz′əm, pwĕrə-, pyər-ə-)
(pyrə-lĭz′əm, pwĕrə-, pyər-ə-)n.
Childish behavior in an adult, especially as a symptom of mental illness.
- sugarplum
- "Sugar Ray."
- "Sugar Ray."
- co-ed
- coedit
- coeditor
- coeducation
- coeducational
- coeducationally
- coefficient
- coefficient of correlation
- coefficient of friction
- coefficient of self-induction
- coefficient of viscosity
- -coel
- coelacanth
- coelacanthine
- coelacanthous
- -coele
- coelenterate
- coelenteric
- coelenteron
- coeliac
- coeliac
- coelom