Three-bladed refers to an object that has three blades, or is designed to work with three blades. A synonym for the word three-bladed is tri-blade. Other synonyms could include three-edged, triple-bladed, three-pronged, or trident. These terms all point to the same idea of an object that has three separate projections or blades that work together to provide a specified function. Some examples of three-bladed objects might include wind turbines, lawn mowers, or kitchen appliances. No matter which term is used, it is clear that the object in question is meant to be used in a three-part system, applying equal force across all three blades to produce the desired result.