Word of the day: planish

"Planish" came floating up into the counscious mind. I'm always trying to think of possible one-word domain names, but I'm beginning to believe that they've all been taken. Certainly, this one has been. How did this word first come into my vocabulary? I'm speculating that it was via Johnny Tremaine (by Esther Forbes). The copy that I read was on somebody else's shelves, and it still had its dust jacket. I see that there are study guides for this book and that it's taught in some classrooms. That'll remove any enjoyment a reader might derive from this story! But, wait! When I go to Google books and search, there's no use of "planish" to be found. So the acquisition of this word remains a mystery.