Robert P. Munafo, 2008 Feb 22.
A mu-atom which is circular in shape; any mu-atom which is directly connected to a larger mu-atom.
A descendant is so-named because it is a child, or a child of a child, etc.
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo, (c) 1987-2012. Mu-ency index