per·ma·frost 
(pûrmə-frôst′, -frŏst′)
(pûrmə-frôst′, -frŏst′)n.
Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.
[PERMA(NENT) + FROST.]
- put (or set) (one's) house in order
- put out
- putout
- put out
- put out to pasture
- put over
- put paid to
- put-put
- put-put
- putrefaction
- putrefactive
- putrefy
- putrescence
- putrescent
- putrescible
- putrescine
- putrid
- putridity
- putridly
- putridness
- putsch
- putschist
- put shoulder to the wheel
- put someone in place
- put (someone) in (someone's) place