What does brachycephalous mean?
Brachycephalous is a technical adjective meaning short-headed: it describes a skull whose breadth is great relative to its length, typically measured by a cranial index of about 80 or higher. The term derives from Greek elements — brachys ('short') and kephalē ('head') — and belongs to the vocabulary of physical anthropology, where nineteenth-century scientists classified human populations by skull shape. It is also applied to animals, most familiarly to dog breeds such as pugs, bulldogs, and boxers, whose selectively bred flat faces make them brachycephalous; such breeds are prone to respiratory problems because of their shortened airways. In contemporary English the closely related form 'brachycephalic' is far more common, leaving 'brachycephalous' largely confined to older scholarly texts and precise technical contexts. Its opposite is 'dolichocephalous', denoting a long, narrow skull. Though rare outside specialist fields, the word offers a compact, exact way to describe one of the most visible features of certain beloved — and medically vulnerable — animal breeds.
adjectiveHaving a relatively short, broad head or skull, in which the width approaches or exceeds the length; used especially in physical anthropology and in describing certain dog breeds.
- (Of a person or population) having a short, broad skull, with a cranial index of roughly 80 or above.
- (Of animals, especially dog breeds) having a characteristically short, broad head and flattened muzzle.
"Pugs and bulldogs are brachycephalous breeds, their flat faces the result of selective breeding."
"Nineteenth-century craniometrists classified human populations into brachycephalous and dolichocephalous types based on skull measurements."
"Veterinarians warn that brachycephalous breeds such as boxers often suffer breathing difficulties in hot weather."
The adorable squashed face of a pug has its own scientific name — and it comes straight from Greek for 'short' and 'head'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of brachycephalous
Brachycephalous combines two Ancient Greek roots: brachys, meaning 'short', and kephalē, meaning 'head', joined via the combining forms brachy- and -cephalous. The term entered English in the mid-nineteenth century, when craniometry and racial classification were active fields of anthropological research. It shares these roots with many other learned words, including cephalopod ('head-foot', the class containing octopuses) and encephalitis ('inflammation within the head').
Related word forms
How brachycephalous is actually used
A technical term found mainly in anthropology, veterinary medicine, and discussions of dog breeding. In modern usage the adjective 'brachycephalic' is considerably more frequent; 'brachycephalous' survives chiefly in older anthropological literature and formal writing.
Easily confused with brachycephalous
Both mean short-headed and are largely interchangeable as adjectives, but 'brachycephalic' is far more common today, while 'brachycephalous' is the older, now rarer form.
Dolichocephalous means the opposite — having a long, narrow skull rather than a short, broad one.