1. (noun) any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ

• vein

2. (noun) one of the horny ribs that stiffen and support the wing of an insect

• vein

1. (noun) any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ

• fibrovascular bundle
• vascular bundle
• vascular strand

2. (noun) one of the horny ribs that stiffen and support the wing of an insect

• rib

1. (noun) any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ

• midrib
• midvein

1. (noun) any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ

• veinal