An element without water molecules is considered?

An element described as "anhydrous" refers specifically to a substance that does not contain any water molecules. The prefix "an-" signifies "without," and "hydrous" relates to water. Therefore, when combined, "anhydrous" directly implies a lack of water. This term is commonly used in chemistry to describe salts or compounds that are typically associated with water but have been dried or treated to remove that water content.

The other terms are not standard in the scientific literature and may cause confusion. They aren't widely accepted or used in the same context as "anhydrous," making "anhydrous" the precise and correct terminology to denote a substance that is devoid of water. Understanding this distinction is crucial for accurately discussing chemical substances, particularly in fields like pharmacy where precise language is essential.