Dionysius Ex·ig·u·us 
(ĕg-zĭgy-əs, ĕk-sĭg-) AD 500?-560?
(ĕg-zĭgy-əs, ĕk-sĭg-) AD 500?-560? Scythian monk and scholar who introduced the method of reckoning the Christian era from the birth of Jesus.
- reductant
- reductase
- reductio ad absurdum
- reduction
- reductional
- reductionism
- reductionist
- reductionistic
- reductive
- reductively
- reductivism
- reductivist
- redundancy
- redundant
- redundantly
- reduplicate
- reduplication
- reduplicative
- reduplicatively
- reduviid
- redux
- red valerian
- red velvet cake
- redware
- red wiggler