rep·li·con 
(rĕplĭ-kŏn′)
(rĕplĭ-kŏn′)n.
A genetic element that undergoes replication as an autonomous unit.
[REPLIC(ATION) + -ON1.]
- second-degree burn
- Second Empire
- second fiddle
- second-generation
- second growth
- second-guess
- second-guesser
- second hand
- second hand
- secondhand
- secondhand smoke
- second home
- secondi
- second lieutenant
- second line
- second-line
- secondly
- second mortgage
- second nature
- secondo
- second of arc
- Secondo Tranquillo.
- second person
- second-person
- second quantum number