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

• abidings
• abies
• abigail
• abigails
• a big noise
• abilities
• -ability
• ability
• ab init
• ab initio
• ab intra
• abiogeneses
• abiogenesis
• abiogenetic
• abiogenetically
• abiogenist
• abiogenists
• abioses
• abiosis
• abiotic
• a bird in the hand is worth two in the bush
• a bit
• a bit much
• a bit of
• a bit of all right