Dictionary.com
definitions

intonaco

[in-ton-uh-koh, -taw-nuh-; Italian een-taw-nah-kaw]
noun, plural in·to·na·cos, Italian in·to·na·ci [een-taw-nah-chee] /inˈtɔ nɑ tʃi/.
  1. (formerly in fresco painting) the last and finest coat of plaster, usually applied in sections and painted while still damp with colors ground in water or a lime-water mixture.
Compare arriccio.

Origin of intonaco

1800–10; < Italian, noun derivative of intonacare to coat, equivalent to in- in-2 + Vulgar Latin *tunicāre, by construal of Latin tunicātus “wearing a tunic” as a ptp; see tunic, -ate1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for intonaco

Historical Examples of intonaco