rat·a·plan 
(rătə-plăn′)
(rătə-plăn′)n.
A tattoo, as of a drum, the hooves of a galloping horse, or machine-gun fire.
[French, of imitative origin.]
- chronogrammatically
- chronograph
- chronographic
- chronographically
- chronologer
- chronologic
- chronological
- chronological age
- chronologically
- chronologist
- chronology
- chronometer
- chronometric
- chronometrical
- chronometrically
- chronometry
- chronoscope
- chronoscopic
- chronotherapeutics
- chronotherapy
- chronotype
- chrys-
- chrys-
- chrysalid
- chrysalis