ter·pol·y·mer 
(tər-pŏlə-mər)
(tər-pŏlə-mər)n.
A polymer that consists of three distinct monomers.
[Latin ter, thrice; see trei- in the Appendix of Indo-European roots + POLYMER.]
- second-rate
- second-rateness
- second-rater
- second sight
- second-story man
- second-strike
- second string
- second-string
- second-stringer
- second thought
- second wind
- Second World
- Second-World
- Second World War
- secrecy
- secret
- secreta
- secretagogue
- secretarial
- secretariat
- secretary
- secretary bird
- secretary-general
- secretary of state
- secretase