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thalweg▼◼◼◼(line that connects the lowest points in a valley or river channel)noun[UK: θˈalweɡ] [US: θˈælweɡ]
trough [troughs]▼◼◼◻(a linear atmospheric depression associated with a weather front)noun[UK: trɒf] [US: ˈtrɒf]
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