u·ra·cil 
(yrə-sĭl)
(yrə-sĭl)n. Abbr. U
A pyrimidine base, C4H4N2O2, that is an essential constituent of RNA.
[UR(EA) + AC(ETIC) + -il, substance relating to.]
- counter
- counter
- counter-
- counteract
- counteraction
- counteractive
- counteractively
- counterargument
- counterattack
- counterbalance
- counterblow
- counterchange
- countercharge
- counter check
- countercheck
- counterclaim
- counterclaimant
- counterclockwise
- counterconditioning
- countercoup
- countercultural
- counterculture
- counterculturist
- countercurrent
- countercurrently