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Douglas Harper's Etymology Dictionary
flat-iron

"iron for smoothing," 1810, from flat (adj.) + iron (n.). Applied to triangular or wedge-shaped buildings from 1862.

Usage examples of "flat-iron".

And so I put to him some other foolish jokes about soapsuds, henpecking, and flat-irons, which set the man into a fury, and succeeded in raising a quarrel between us.