\Re*ju`ve*nes"cence\ (-n?s"sens), n.
1. A renewing of youth; the state of being or growing young
   again.
2. (Bot.) A method of cell formation in which the entire
   protoplasm of an old cell escapes by rupture of the cell
   wall, and then develops a new cell wall. It is seen
   sometimes in the formation of zo["o]spores, etc.