16-letter words starting with pro
- protective slope — a slope given to a yard or the like to drain surface water away from a building.
- protestant ethic — work ethic.
- proteus syndrome — a condition caused by malfunction in cell growth, in which bone and flesh tissue overgrow in localized areas of the body
- proto-algonquian — the unattested parent language from which the Algonquian languages are descended.
- provost sergeant — the senior noncommissioned officer of a prison or other confinement facility whose chief duty is the supervision of prisoners and of the military police unit.
- proxima centauri — the nearest star to the sun at a distance of 4.3 light-years, part of the Alpha Centauri triple-star system located in the constellation Centaurus.
- proxime accessit — the person coming next after the winner in a competitive examination or an academic prize giving; runner-up