Steel/stiːl/ Definition 1 of 4Pro Tip 1/3Industrial Usage Steel is commonly associated with strength and industrial uses, especially in construction. The skyscraper's framework is reinforced with steel beams. Pro Tip 2/3Figurative Expression Steel can be used as a metaphor for something exceptionally strong or resilient. Her will was as strong as steel during the negotiations. Pro Tip 3/3Not Always Iron Although steel contains iron, not all iron products are considered steel. They replaced the iron gate with a more durable steel one.