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

• siliceous
• silicic
• silicic acid
• silicicolous
• silicide
• silicides
• siliciferous
• silicification
• silicifications
• silicified
• silicifies
• silicify
• silicifying
• silicious
• silicium
• silicle
• silicles
• silicon
• silicon carbide
• silicon carbides
• silicon chip
• silicone
• silicones
• silicons
• silicon valley