[fres-koh] 
noun, plural -coes, -cos, verb, -coed, -co⋅ing.| 1. | Also called buon fresco, true fresco. the art or technique of painting on a moist, plaster surface with colors ground up in water or a limewater mixture. Compare fresco secco. |
| 2. | a picture or design so painted. |
| 3. | to paint in fresco. |
