pro·throm·bin 
(prō-thrŏmbĭn)
(prō-thrŏmbĭn)n.
A plasma protein that is converted into thrombin during blood clotting.
- postmillenarianism
- postmillennial
- postmillennialism
- postmillennialist
- postmillennian
- postmistress
- postmodern
- postmodernism
- postmodernist
- postmortem
- post mortem
- postmortem examination
- postnasal
- postnasal drip
- postnatal
- postnatally
- postnuptial
- postnuptially
- post office
- post office box
- post-op
- postop
- postoperative
- postoperatively
- postorbital