The Collaborative International Dictionary
Mezzotintoing
Mezzotinto \Mez`zo*tin"to\, v. t. [imp. & p. p. Mezzotintoed; p. pr. & vb. n. Mezzotintoing.] To engrave in mezzotint; to represent by mezzotint.
Wiktionary
mezzotintoing
vb. (present participle of mezzotinto English)