Definition of intrados in English:

intrados

noun

Architecture
  • The lower or inner curve of an arch.

    Often contrasted with extrados
    • ‘The intrados or the inner rim of the arch shows its most distinctive feature - a fringe of lotus-bud carving.’

Origin

Late 18th century: from French, from intra- on the inside + dos the back (from Latin dorsum).

Pronunciation:

intrados

/ˈintrəˌdōs//ˈintrədäs/