grei·sen 
(grīzən)
(grīzən)n.
A granitic rock composed chiefly of quartz and mica.
[German, from greissen, to split.]
- extravert
- extravert
- extraverted
- extraverted
- extra-virgin olive oil
- extremal
- extreme
- extremely
- extremely high frequency
- extremely low frequency
- extremeness
- extreme unction
- extremism
- extremist
- extremity
- extremophile
- extremum
- extricable
- extricate
- extrication
- extrinsic
- extrinsically
- extrinsic factor
- extro-
- extro-