Flu'id·al adjective Pertaining to a fluid, or to its flowing motion. Fluidal structure (Geol.) , the structure characteristic of certain volcanic rocks in which the arrangement of the minute crystals shows the lines of flow of thew molten material before solidification; -- also calle... Found on http://www.encyclo.co.uk/webster/F/48
1) Having watery qualities 
• (a.) Pertaining to a fluid, or to its flowing motion.
Flu'id·al adjective Pertaining to a fluid, or to its flowing motion. Fluidal structure (Geol.) ,