Plural of formyl; multiple chemical groups each consisting of one carbon, one hydrogen, and one oxygen atom bonded together.
Regular plural of formyl. As chemistry became more systematic in the 19th century, the plural form emerged naturally when discussing multiple formyl groups within larger molecules.
When you have multiple formyl groups attached to a single molecule, you get different chemical properties—it's like adding multiple LEGO pieces of the same type creates increasingly complex structures.
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