The noun "iron" can be both countable and uncountable.
iron → uncountable
Meaning: a strong, hard metal
Example sentence: Pots and pans used to be made of iron, but now they're made of stainless steel.
iron → countable
Meaning: a household appliance for smoothing out wrinkles in clothes
Example sentence: Let the iron get hot before you starting ironing the clothes.
Note: In chemistry, "iron" is one of the chemical elements (symb. Fe) and one of the trace elements needed by our bodies. This meaning is uncountable.
In which sentence is the word "iron" countable?
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Contributor: Matt Errey