dross
UK[drɒs]US[drɑːs]
n
The scum or waste material that forms on the surface of molten metal.
n
Something that is worthless, trivial, or of low quality.
Etymology
The word 'dross' entered English from its Old English ancestor, carrying the core sense of impurities or waste. Its deeper origins are traced to a Proto-Germanic root, likely conveying the idea of sediment or something fallen away. The semantic journey is a clear and logical metaphor: just as dross is the worthless scum removed from purified metal, the term came to broadly signify anything considered trivial, inferior, or rubbish. This evolution from a specific metallurgical byproduct to a general term for valueless matter illustrates a classic path of semantic extension based on a shared quality of worthlessness.
Analysis
The word is a simplex. It is a loanword from Old English drōs, meaning dregs or lees, which is related to Old High German truosana (dregs).
Examples
The silversmith carefully skimmed the dross from the surface of the molten silver.
His latest book contains a few good ideas buried in a lot of literary dross.
We must separate the valuable data from the digital dross.