BIRCH (data clustering) definition

(1) Consisting of or made of wood of the birch tree

(2) A switch consisting of a twig or a bundle of twigs from a birch tree; used to hit people as punishment

"My father never spared the birch"

(3) Any betulaceous tree or shrub of the genus Betula having a thin peeling bark

(4) Hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood

(5) Whip with a birch twig