dynam-
prefix
 (sometimes before a vowel) a variant spelling of dynamo-
dynamo- or (sometimes before a vowel) dynam-
combining form
indicating power
⇒ 
dynamoelectric
⇒ 
dynamite
Origin
from Greek, from dunamis power☞ dyna-
dynam-
combining form 
or dynamo-
Etymology: probably from French, from Greek, from dynamis 
 : power 
< dynamism >
< dynamograph >
or dynamo-
< dynamism >
< dynamograph >