Flanged railway wheel. A flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel.
noun, plural subtleties. 1. the state or quality of being subtle. 2. delicacy or nicety of character or meaning. 3. acuteness or penetration of mind; delicacy of discrimination. 4. a fine-drawn distinction; refinement of reasoning: the subtleties of logic.
1. (n.) The quality or state of being subtle; thinness; fineness; as, the subtlety of air or light. 2. (n.) Refinement; extreme acuteness; subtlety. 3. (n.) Cunning; skill; craft. 4. (n.) Slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety. International Standard Bible Encyclopedia.