Definition of "Birch" :

noun: 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."

noun: any betulaceous tree or shrub of the genus Betula having a thin peeling bark

noun: hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood

verb: whip with a birch twig

adjective: consisting of or made of wood of the birch tree