Plural of flatiron; multiple pressing tools or buildings with that distinctive wedge shape.
Regular plural of 'flatiron' formed by adding '-s'. Both the household tool and the architectural term use the same word because of the shared flat, iron appearance.
Before electric irons existed in the late 1800s, families would heat multiple flat irons on the stove so they could keep ironing while others were reheating—it was a surprisingly efficient assembly-line process!
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