hygroferrous
Hygroferrous refers to a hypothetical substance or material that possesses both hygroscopic and ferrous properties. Hygroscopic materials have the ability to absorb and hold water molecules from the surrounding atmosphere. Ferrous materials are those that contain iron, or are derived from iron. Therefore, a hygroferrous substance would be one that can attract and retain moisture while also exhibiting characteristics associated with iron, such as magnetism or its metallic properties.
The term "hygroferrous" is not a standard scientific term and is likely a portmanteau combining the prefixes