cy·clin 
(sīklĭn)
(sīklĭn)n.
Any of a class of proteins that fluctuate in concentration at specific points during the cell cycle and that regulate the cycle by binding to a kinase.
- seven seas
- seventeen
- seventeenth
- seventeen-year locust
- seventh
- Seventh Avenue
- Seventh-day Adventist
- seventh heaven
- seventh-inning stretch
- seventieth
- seventy
- seventy-eight
- seven-up
- Seven Wonders of the World
- sever
- severability
- severable
- several
- severalfold
- severally
- severalty
- severance
- severance pay
- severance tax
- severe