, a keima
is a stone that is displaced from another stone of the same color by the shape of a knight's move
- 1 line one way and 2 lines the other. Since in japanese
"Dia" means big, a Daigeima is a big version of a keima, so it means 3 lines in one way and 1 in the other. The k to g sound change is part of japanese rules for making compound words.
Japanese Go terms