Cull 1 : (1) A tree or log of utilisable size which is of no commercial value because of defects. (2) To reject defective or unmerchantable trees or logs
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}