WADI - a stream or stream bed which can become a deep gully or valley. During the dry season a wadi is typically dry but during the rainy season the wadi can fill with water becoming a pathway for a raging torrent of water. As the water flows in a wadi it cuts into the soft, porous rock widening the wadi. Typically a wadi leads to a larger and more dependable water source. The word "wadi" is Arabic. The corresponding Hebrew term is nahal.

WISDOM PSALM - a type of psalm which meditates on the "good life" as defined in Israelite wisdom literature (e.g., Pss. 37, 49, 73).