emarginate

There is an ordinary English word sitting in the middle of emarginate, and it is margin. Once that is visible the spelling stops being difficult, which is why eleven of these spellings are people who could not see it.

Notched at the tip, as though a small bite had been taken out of the end of the blade. Common in clovers and in many woodland herbs.

Latin margo, stem margin-, is an edge or border, and it is the same margo that gives English margin. The prefix e- means out of or away from, so emarginatus describes an edge with something taken out of it. The g goes soft because an i follows it, exactly as it does in margin itself.