IPA: /ˈspeɪd.fəl/
KK: /ˈspeɪdˌfʊl/
The quantity that can be held in a spade or shovel at one time.
He dug a spadeful of dirt to plant the tree.
Spadeful → It is formed from "spade" (from Old English *spadu*, meaning a tool for digging) and "-ful" (meaning full of). The word "spadeful" means a quantity that fills a spade.
Think of a spade, which is a tool for digging, and remember that a spadeful is a quantity that fills that tool.