mas·ter·y 
(măstə-rē)
(măstə-rē)n. pl. mas·ter·ies
1. Possession of consummate skill.
2. The status of master or ruler; control: mastery of the seas.
3. Full command of a subject of study: Her mastery of economic theory impressed the professors.
- chronometric
- chronometrical
- chronometrically
- chronometry
- chronoscope
- chronoscopic
- chronotherapeutics
- chronotherapy
- chronotype
- chrys-
- chrys-
- chrysalid
- chrysalis
- chrysanthemum
- chryselephantine
- Chrysler
- chryso-
- chrysoberyl
- chrysocolla
- chrysolite
- chrysomelid
- chrysophyte
- chrysoprase
- Chrysostom
- chrysotherapy