Sy·ros 
(sīrŏs′) also Sí·ros (sērôs′)
(sīrŏs′) also Sí·ros (sērôs′) An island of Greece in the north-central Cyclades. It is the richest and most populous of the Cyclades.
- retroactively
- retroactivity
- retrocede
- retrocession
- re-trod
- re-trodden
- retroelement
- retrofire
- retrofit
- Aristophanes of Byzantium
- Aristotelean
- Aristotelian
- Aristotelianism
- Aristotelian logic
- Aristotle
- Aristotle Socrates
- arithmetic
- arithmetically
- arithmetician
- arithmetic mean
- arithmetic progression
- arity
- -arium
- Arius
- Ariz.