head voice

from The Century Dictionary.

• noun In singing, that method of using the voice, or that portion of the singer's compass, which tends to produce head-tones.

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

• noun phonology a kind of voice of high pitch and of a thin quality ascribed to resonance in the head; voice of the thin register; falsetto. In producing it, the vibration of the cords is limited to their thin edges in the upper part, which are then presented to each other.

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

• noun the higher ranges of the voice in speaking or singing; the vibrations of sung notes are felt in the head