vex·il·lol·o·gy 
(vĕk′sə-lŏlə-jē)
(vĕk′sə-lŏlə-jē)n.
The study of flags.
vex·il′lo·logi·cal (vĕk-sĭl′ə-lŏjĭ-kəl) adj.
vex′il·lolo·gist n.
- extravasate
- extravasation
- extravascular
- extravehicular activity
- extraversion
- extraversion
- 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