Definition of metopism in US English:

metopism

noun

Anatomy Anthropology
  • Persistence of the frontal (metopic) suture of the skull (which commonly undergoes closure and obliteration in childhood).

Origin

Late 19th century; earliest use found in William Flower (1831–1899), zoologist and museum curator. From French métopisme from métop- (in métopique) + -isme.

Pronunciation

metopism

/ˈmɛtəpɪz(ə)m/