brachycephalic

(brăk'ĭ-sə-făl'ĭk) also brach·y·ceph·a·lous (-sĕf'ə-ləs)
adj.
Having a short, broad head with a cephalic index over 80.

brachycephaly brach'y·ceph'a·ly (-sĕf'ə-lē) or brach'y·ceph'a·lism n.

(brak′i-səf-al′ik)
adj

Descriptive term applied to a broad, round head having a cephalic index of more than 80.

[De]

Descriptive term applied to human skulls where the cephalic index (greatest breadth expressed as a percentage of maximum length) is above 80 per cent. Individuals with such skulls may be said to be broad-headed. Compare dolichocephalic.

Having a short wide head.

• b. breeds — those dog breeds with very short faces, e.g. Boxer, Bulldog, King Charles spaniel, Pekingese, Pug. Associated with this type of skull, these breeds suffer from anomalies of the upper respiratory tract such as stenotic nares, elongated soft palate, and everted laryngeal saccules, and associated disorders, e.g. facial fold dermatitis. They are also predisposed to neoplasms of chemoreceptor tissue.
• b. obstructive syndrome — any of several upper airway disorders, prevalent in brachycephalic dogs, may lead to elongation and thickening of the soft palate, chronic pharyngitis and tonsillitis, inflammation and decreased diameter of the larynx and trachea. Conditions which predispose are everted laryngeal saccules, laryngeal collapse, stenotic nares.

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The adjective has one meaning:

Meaning #1: having a short broad head with a cephalic index of over 80
  Synonyms: brachycranial, brachycranic
  Antonym: dolichocephalic (meaning #1)

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