thalweg or talweg /tälˈveg, -vāhh/ (geology)

1. The longitudinal profile of the bottom of a river bed
2. The middle of a main navigable waterway, acting as a boundary between states

• porters' knot
• porter's lodge
• portess
• portesse
• portesses
• port-fire
• port-fires
• portfolio
• portfolios
• porthole
• portholes
• porthors
• porthos
• porthouse
• portico
• porticoed
• porticoes
• porticos
• portier
• portiest
• portigue
• portigues
• porting
• portion
• portioned