Definition of cryptozygous in US English:

cryptozygous

adjective

Anthropology
rare
  • Designating a skull whose zygomatic arches cannot be seen when it is viewed from above; (also) designating the zygomatic arches of this type of skull; opposed to phenozygous.

Origin

Mid 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist.

Pronunciation

cryptozygous

/ˌkrɪptə(ʊ)ˈzʌɪɡəs/