step-great-granddaughter Share definition Flag 1. The daughter of one's stepgrandchild. 2. The stepdaughter of one's grandchild. My step-great-granddaughter is a good person. step-great-granddaughter by Elivaldeq November 24, 2019 0 0 Get merch Get the step-great-granddaughter mug. Buy Now — $32.95 See more merch