hydroscopic is incorrectly written and it should be written as "hygroscopic" being its meaning:
Masculine singular adjective of Hygroscopicity, of Greek origin: ygros ygra ygron: damp, wet and skopeo verb: observe, look at, examine: what looks like wet. It's really what absorbs moisture from the surrounding environment. Some of these substances have been used as desiccants in writing ink of the past.
