A chemical compound formed when fluorine combines with another element, especially used in toothpaste and water treatment.
From 'fluor-' (fluorine) plus the suffix '-id', similar to how 'chlorine' becomes 'chloride'. This is an incomplete or archaic form of 'fluoride'.
This appears to be an archaic or incomplete form that modern chemistry has standardized to 'fluoride'—it's a good example of how scientific terminology evolves toward consistency and clarity.
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