1. 昆虫の翅を固くして支える角質の肋骨の1つ(one of the horny ribs that stiffen and support the wing of an insect)
2. 葉または他の植物器官の通道組織と支持組織の分枝状組織を形成する維管束または肋(any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ)