Splinter

SPLINTER noun

[ C ] uk/ˈsplɪntər/ us
a small, sharp piece of wood, glass, etc which has broken from a large piece

осколок, заноза
I've got a splinter in my finger. a splinter group
a small group of people that forms after leaving a larger organization, such as a political party

отколовшаяся группа
splinter verb [ I ]
to break into small, sharp pieces

разбиваться, раскалываться