ton·do 
(tŏndō, tôn-)
(tŏndō, tôn-)n. pl. ton·di (-dē) also ton·dos
A round painting, relief, or similar work of art.
[Italian, short for rotondo, round, from Latin rotundus; see ROTUND.]
tondo1825 painting of the Speckter sisters by Erwin Speckter (1806-1835)