Midtones
From The Glossary of Digital Photography
The neutral, middle gray tones in an image or a print. Occasionally midtones are defined as a range of values of about 25%-30% to about 70%-75% of the full range of brightness available.

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
The neutral, middle gray tones in an image or a print. Occasionally midtones are defined as a range of values of about 25%-30% to about 70%-75% of the full range of brightness available.