Definition of cabbagehead:
(n) :
A stupid person; an idiot.
(n) :
A head of cabbage.
(n) :
The larval form (caterpillar) of Crocidolomia pavonana, which is a pest that eats cabbages.
(n) :
A style of smokestack on a wood-burning locomotive that has a roughly spherical top on a straight narrow stack.
(n) :
A common type of jellyfish, Stomolophus meleagris
(n) :
(geology) A roughly spherical aggregation of a mineral.