su·per·clus·ter 
(spər-klŭs′tər)
(spər-klŭs′tər)n.
A group of neighboring clusters of galaxies.
- 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.
- Arizona
- Arizonan
- Arizonian
- Arjuna
- ark