the high register of the human voice.
Origin of head register
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for head register
The head-register, even in womans voice, is capable of great expansion, if good habits of tone-production are followed.The Child-Voice in Singing|Francis E. Howard