A chemical compound in the ethide family; a salt or compound derived from ethylene or related to ethane chemistry.
From 'eth-' (relating to ethylene or ethane, from Greek 'aither' meaning ether) plus '-id' (a chemical suffix denoting compounds, particularly salts).
Most people have never heard of ethids because they're primarily used in specialized organic chemistry—they're the boring cousins of ethers that chemists care deeply about.
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