head·shake 
(hĕdshāk′)
(hĕdshāk′)n.
A turning of one's head to the right and left, signifying denial, disapproval, disbelief, doubt, or bewilderment.
headshak′ing adj. & n.
- precedent
- precedential
- preceding
- precentor
- precentorial
- precept
- preceptive
- preceptively
- preceptor
- preceptorial
- preceptorially
- preceptorship
- preceptory
- preceramic
- precess
- precession
- precessional
- precession of the equinoxes
- pre-Christian
- precinct
- preciosity
- precious
- preciously
- precious metal
- preciousness