Any of various diseases of animals characterized by edema of the head and neck. big-head.
1. Any of several diseases of animals marked by swelling about the head.
2. An exaggerated opinion of one's importance — usually used with the.
A noncontagious virus disease chiefly of sheep that is caused by a reovirus (genus Orbivirus) transmitted by biting midges and is characterized especially by swelling and ulceration of mucous membranes of the mouth and tongue.