big-headed

bighead

[big-hed, -hed]
noun
1.
Informal. an excessive estimate of one's importance; conceit.
2.
Veterinary Pathology.
a.
an inflammatory swelling of the tissues of the head of sheep, caused by the anaerobic bacillus Clostridium novyi.
b.
enlargement of the head and jawbones of horses resulting from nutritional hyperthyroidism.

Origin:
1795–1805, Americanism; big1 + head

bigheaded, adjective
bigheadedness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bighead (ˈbɪɡˌhɛd)
 
n
1.  informal a conceited person
2.  informal (US), (Canadian) conceit; egotism
3.  vet science
 a.  an abnormal bulging or increase in the size of an animal's skull, as from osteomalacia
 b.  any of various diseases of sheep characterized by swelling of the head, esp any caused by infection with Clostridium bacteria
 
big'headed
 
adj
 
big'headedly
 
adv
 
big'headedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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