Definition of pachymeninx in US English:

pachymeninx

noun

Anatomy
  • The dura mater.

Origin

Late 19th century; earliest use found in John S. Billings (1838–1913). From pachy- + meninx, perhaps after Hellenistic Greek μῆνιγξ παχύτερη (Galen).

Pronunciation

pachymeninx

/ˌpakɪˈmiːnɪŋks/