1. any item of production, e.g., trees, logs, lumber, or seedlings, rejected because it does not meet certain specifications of usability or grade 2. logs that are rejected, parts of logs deducted in measurement, or the deduction made from gross timber volume because of defects —note in a standing tree, the cull expressed as a percent of the tree's gross volume is termed the cull factor —see live cull This definition last updated 10/25/2008