noun
obsolete element
Technical term for a component, feature, or specification that is no longer current or supported. Often used in engineering, computing, or standards contexts.
この規格では、廃要素として扱われる機能がいくつかある。
In this standard, there are several features treated as obsolete elements.
noun-modifying (irregular)
obsolescent
Prenominal use describing something that is becoming obsolete or is in the process of being phased out. Less common than the noun form.
廃要素の技術は、新しいシステムではサポートされない。
Obsolescent technologies are not supported in the new system.
旧式 means old-fashioned or outdated in a general sense, whereas 廃要素 is a more technical term for a deprecated component.
Compound of 廃 (hai, 'obsolete, disused') and 要素 (yōso, 'element, component'). A modern technical coinage, likely from engineering or computing terminology.