Archit. the inside curve or surface of an arch or vault
Origin of intradosFrench ; from Classical Latin intra, within + French dos ; from Classical Latin dorsum, the back
nounpl. in·tra·dos or in·tra·dos·es Architecture
The inner curve of an arch.
Origin of intradosFrench : intra-, within (from Latin intra-; see intra–) + dos, back (from Old French, from Latin dorsum).