in·tron 
(ĭntrŏn)
(ĭntrŏn)n.
A segment of a gene situated between exons that is removed before translation of messenger RNA and does not function in coding for protein synthesis.
[intr(agenic), occurring within a gene (INTRA- + GENIC) + -ON1.]
- intestinal fortitude
- intestinally
- intestine
- in that
- in the abstract
- in the aggregate
- in the air
- in the bad graces of
- in the bag
- in the balance
- in the bargain
- in the blink of an eye
- in the buff
- in the can
- in the cards
- in the circumstances
- in the clear
- in the clouds
- in the dark
- in the dock
- in the doghouse
- in the dust
- in the end
- in the event
- in the extreme