A waxy substance secreted by certain insects and plants, or a wax-like coating used in art and manufacturing.
From Latin 'cera' meaning wax, derived from Proto-Indo-European root *ker- meaning to make or produce. The word entered English through scientific and technical terminology where it describes natural wax-like substances.
Beeswax, shellac, and carnauba wax are all examples of cera—and the word is so old that ancient Romans used it for writing tablets, candles, and even waterproofing ships!
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