pre·verb 
(prēvûrb′)
(prēvûrb′)n.
A prefix or particle preceding the root or stem of a verb, as for- in forget.
pre·verb adj.
- under pain of
- underpants
- underpart
- underpass
- underpay
- underpayment
- underperform
- underperformance
- underperformer
- underpin
- underpinning
- underplay
- underplot
- underpopulated
- underpopulation
- underprice
- underprivileged
- underproduce
- underproduction
- underproof
- underprop
- underran
- underrate
- underreact
- underreaction