Rejuvenescence \Re*ju`ve*nes"cence\ (-n?s"sens), n.
1. A renewing of youth; the state of being or growing young
again.
[1913 Webster]
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 zoospores, etc.
[1913 Webster]