chest voice

from The Century Dictionary.

• noun A tone of the voice which arouses sympathetic vibration in the chest or thorax. Also called chest-tone. See head-voice.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun phonology a kind of voice of a medium or low pitch and of a sonorous quality ascribed to resonance in the chest, or thorax; voice of the thick register. It is produced by vibration of the vocal cords through their entire width and thickness, and with convex surfaces presented to each other.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the lower ranges of the voice in speaking or singing