1. (noun) a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth

• vascular tissue

2. (noun) the inner layer of the periosteum

• stratum

1. (noun) a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth

• cambial

2. (noun) the inner layer of the periosteum

• cambial